Of course, the layoffs at Hewlett-Packard (HPQ) were expected, part of its cost-cutting integration after the $13.25 billion acquisition of Electronic Data Systems.

HP said yesterday that the 24,600 jobs the tech giant axed, or 7.5 percent of the total work force, were made to “streamline the combined company’s services” businesses.

But BoomTown has to wonder if other big tech and Internet companies might not be looking at HP’s move and the current economic mess and wonder if it might be a good time to pare down a bit, after a spate of overhiring.

In fact, the ill winds that will surely be blowing west from Wall Street remind me of the classic lines of noir crime novelist Raymond Chandler:

There was a desert wind blowing that night. It was one of those hot dry Santa Anas that come down through the mountain passes and curl your hair and make your nerves jump and your skin itch. On nights like that every booze party ends in a fight. Meek little wives feel the edge of the carving knife and study their husbands’ necks. Anything can happen.”

Indeed, bad times, as one smart exec told me yesterday over lunch, are very good times to clean house.

And, as I wrote yesterday in post called “Dear Web 2.0: It’s Still the Economy, Stupid,” the frightening gyrations of the financial markets will surely impact Silicon Valley, as much as the culture here tries to pretend it will never be affected.

And that’s why I am guessing the sector is going to be seeing some judicious job cuts from managers in the next few months.

Yesterday, for example, our most excellent blogger contributor, Eric Savitz of Barron’s, cited a report by Wedge Parters on the online auction giant eBay. Paraphrasing the Wedge report, he noted “the company’s business is ‘deteriorating’ and that the company is readying layoffs that could affect 10 percent of the company’s 15,000 employees.”

Many think companies like Yahoo (YHOO), Microsoft (MSFT) and even Google (GOOG) must start to smartly make cuts–even if they add in other areas–to make sure that they are lean and mean in a less frothy market.

And I am also guessing start-ups, even those flush with investment cash, have to be thinking hard about spending as freely.

While you certainly can’t cut your way into growth, a little prudence is one quality Web 2.0 is probably about to learn.

As readers of AllThingsD.com might have noticed, we added MarketWatch columnist Therese Poletti (pictured here) to the main rail of the site today.

Her twice-weekly column, Tech Tales, which appears on MarketWatch on Tuesdays and Thursdays, will also be published here too.

Poletti joins Eric Savitz (pictured here) of Barron’s, whose posts on his Tech Trader Daily blog about tech stocks have been appearing on the front of ATD several times a day for the past month.

We added these two very talented voices from other publications within Dow Jones (owner of this site), because we want to bring more cogent and useful news and analysis about tech and media to our readers. Also, they rock.

In all seriousness, the tech blogging arena is one with a lot of players–some great and some not so much–so we are especially proud of the high standards, accuracy and quality that each of these writers represents.

We will be adding more writers soon, so watch this space.

Of course, we also don’t believe in only cross-promoting Dow Jones brands, and publish a half-dozen major links to other sites daily in Voices, along with our tabbed front page feeds that link directly to CNET, paidContent, GigaOm and Techmeme.

We admire the work those sites are doing and, most of all, want to give our readers as many ways as possible to access the best posts being done across the digital landscape.

Of course, BoomTown and John Paczkowski’s Digital Daily remain the anchor of the main rail, while the work of Walt Mossberg and Katherine Boehret gets its own place at the top of the main home page of ATD.

In all, we hope readers find our commitment to giving you high-quality and incisive work–from scoops to analysis to reviews–helpful and we welcome any feedback.

Even with Abu Dhabi buying up shares of tech firms like Advanced Micro Devices and the bubbly euphoria in Silicon Valley’s Web 2.0 sector, the tech picture is getting less pretty, according to a report by Barron’s Eric Savitz on the downgrading of software stocks by Goldman Sachs.

Noting a softening in capital spending, Savitz quotes Goldman’s report that said, “with software a typically back-end loaded sale, if there is any concern on budgets in the early part of 2008, we would expect CIOs to hold off their purchases until later in the year.”

So Goldman cut estimates slightly on Adobe, Autodesk, BEA, BMC, CA, Check Point, Citrix, Cognos, CommVault, Informatica, Macrovision, McAfee, Oracle, Quest Software, Red Hat, RightNow, SAP, Secure Computing, Symantec and Tibco.

Could ad-supported or commerce-driven Web sites be next? To say nothing of the spate of pre-revenue–our kind way of saying none to speak of–Web 2.0 start-ups.