Incredibly, this is the seventh year of the D: All Things Digital conference.

We feel very lucky to get here, especially in the midst of what our own site’s Digital Daily scribe, John Paczkowski, has so perfectly dubbed the “econalypse.”

Ironically, Walt Mossberg and I planned to launch the very first conference in the middle of the last major downturn for tech, in 2001. But, in the carnage of the Web 1.0 meltdown, we actually held off for two years, with our first D gathering taking place in 2003.

It’s been a real winning streak since then for D, due in large part to our great speakers–such as Microsoft (MSFT) icon Bill Gates and Apple (AAPL) legend Steve Jobs.

Both have been onstage many times over the years, including a historic interview the pair of tech titans did together in 2007 at D5.

Other amazing speakers have included: Howard Stringer of Sony (SNE), Barry Diller of InterActiveCorp (IACI), legendary director George Lucas, Time Warner (TWX) CEO Jeff Bewkes, Jeff Bezos of Amazon (AMZN), former eBay (EBAY) CEO Meg Whitman, News Corp. (NWS) head Rupert Murdoch, Microsoft head Steve Ballmer, Walt Disney (DIS) honcho Bob Iger, Bobby Kotick of Activision Blizzard (ATVI), CBS (CBS) CEO Les Moonves, Democratic and Republican pols like former Vice President Al Gore and Sen. John McCain, all the leadership of Google (GOOG) and many, many more.

We have had a lot of great moments onstage with all these tech and media players over the years, to be sure, with interviews ranging from the funny to the sublime to the truly disastrous.

But, like the digital industry and the innovation our conference focuses on, we also like to lean forward to try to figure out what the Next Big Thing is around the corner, whether it comes from Silicon Valley or not.

That’s why we’re kicking off our conference on May 26 with two of the founders of Twitter–Biz Stone and Evan Williams–who are riding high on tech’s latest hot thing, which might turn out to be either a rocket ship or a shooting star.

They’ll be followed up over the next two days by a plethora of interesting players, from the leaders of several major mobile companies to content execs hit hard by fast-moving digital forces to a new Internet leader like Yahoo (YHOO) CEO Carol Bartz, who is trying to turn around one of the Web’s great icons from its more recent lackluster path.

And, as we always do, we will be featuring a spate of demos too, trying to see if we can unearth that next next thing.

In the past, the D stage has seen the debut of start-up products like Sling Media’s Slingbox, Aliph’s Jawbone and Pure Digital’s Flip, all of which have gone onto glory. And also some, like Palm’s Foleo, which did not.

While not everyone can attend D, our crack staff is committed to bringing all the action from this year’s conference to readers of the All Things Digital site via up-to-the-minute blogs, photos, videos, tweets, digs and more. We’ll also, as soon as we can, post the videos of each of the onstage sessions, in their entirety.

Until it all kicks off, here is the list of speakers, below, in alphabetical order, who will be appearing at 2009’s D7 conference:

Irving Azoff | CEO of Ticketmaster Entertainment (TKTM)

Mitchell Baker | Chairman of Mozilla

Steve Ballmer | CEO of Microsoft

Carol Bartz | CEO of Yahoo

Mark Cuban | Chairman of HDNet and Owner of the Dallas Mavericks, Landmark Theaters and Magnolia Pictures

Eve Ensler | Playwright and Founder of V-Day

Arianna Huffington | Editor-in-Chief of the Huffington Post

Olli-Pekka Kallasvuo | CEO of Nokia (NOK)

Mike Lazaridis | Co-CEO of Research In Motion (RIMM)

John Lilly | CEO of Mozilla

John Malone | Chairman of Liberty Media Corporation (LCAPA)

Roger McNamee | Partner, Elevation Partners

Jon Miller | Chief Digital Officer of News Corp.

Jon Rubinstein | Executive Chairman, Palm (PALM)

Randall Stephenson | CEO of AT&T (T)

Biz Stone | Co-founder of Twitter

Owen Van Natta | CEO of MySpace

Katharine Weymouth | Publisher of the Washington Post (WPO)

Evan Williams | Co-founder and CEO of Twitter

Jeff Zucker | CEO of NBC Universal (GE)

Specifically, in how to make bank from Yahoo’s desperation.

That would be entrepreneur and all-around bon vivant Mark Cuban (he is pictured here at our first D: All Things Digital conference in 2003), who sold Broadcast.com to Yahoo in the heady days of 1999 for $5.7 billion in Yahoo stock.

It was a huge deal at the time, with Yahoo engaged in an arms war with other Internet companies like Excite (remember them?), AOL (TWX) and others.

In an acquisitions frenzy, it grabbed Broadcast.com, which was started in 1992 as AudioNet, with Cuban and others in charge.

Broadcast.com was one of the nascent efforts to broadcast online, focusing on radio-like content on the Web, largely using sports and other live events.

It had one of those typical Web 1.0 faux-blockbuster IPOs in 1998 and then, as the stock began to decline, sold quickly to Yahoo a year later.

Right before, as it turned out, the whole bubble burst.

But Cuban and his cohorts made their scratch and were soon gone from Yahoo.

Cuban, sensing the end was nigh, also dumped his Yahoo shares before the decline. And, armed with a fortune, he began his fun foray into a range of businesses, from sports teams to movie theaters to his HDNet, a high-definition cable network.

And, of course, the private jets and entertaining courtside antics and working at the Dairy Queen!

And, also of course, most of Broadcast.com’s assets are useless to Yahoo today.

Now, Cuban is back knocking at Yahoo’s door as an invader, the only major Internet figure apparently willing to turn on the iconic Yahoo CEO and Co-Founder Jerry Yang.

Calling Benedict Arnold!

I don’t blame Cuban, actually, although Yang surely will be angry over his presence on the Icahn board.

There was always a level of rancor within Yahoo about Cuban, because he sold Broadcast.com at the top, traded out of Yahoo shares at the top and then simply sat back and watched it all as a billionaire gadfly.

BoomTown used to even tease Yang about how Cuban was richer than he was and got to have all the fun. It would always get a glare out of him.

So too could Cuban, as in this post from his smart Blog Maverick (of course, it is named that!) blog, right after Microsoft’s (MSFT) unsolicited bid for Yahoo,.

In it, Cuban urged Yang to sell to the Internet giant, largely due to the pressure of competing with Google (GOOG).

Cuban wrote:

Building a world class Yahoo to be the best company it possibly can be using the management skills that Jerry and company have is a far different challenge than optimizing the stock price. Particularly when Google is your stock comp…

Which is exactly why Jerry and David should sell to MSFT…

So the question isn’t whether Yahoo should sell. It should. The only question is what the structure of the deal should look like so that Jerry and David can achieve many of the goals they set out to accomplish on the net under the MSFT umbrella. Jerry definitely is about customers first. This is his chance to show it…

So Yahoo should say yes. It’s less about the money than about finally achieving the corporate goals set out more than a decade ago. One time Jerry told me that Yahoo stood for You Always Have Other Options. This time Yahoo doesn’t, but their customers options could improve exponentially if Yahoo says yes.”

Given the Yahoo acquisition of Broadcast.com gave the clever Cuban the billions he has used so entertainingly, it’s all kind of ironic, no?