Apparently, not everyone leaves Yahoo to join Microsoft.

On Friday, sources said, it was announced internally at Microsoft that Karl Siebrecht, the former president of Atlas at aQuantive, is joining AdReady at the end of the month as president and COO.

AdReady, based in Seattle, bills itself as an “advertising technology company focused on making online display advertising accessible and effective for advertisers of all sizes.”

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Platform-A President Greg Coleman–the former Yahoo advertising sales exec who came to AOL only three months ago–is leaving the company, sources said, as new CEO Tim Armstrong remakes his top staff in preparation to spin off the Time Warner online unit.

Coleman was brought to AOL by former CEO Randy Falco in February, replacing Lynda Clarizio, and will be replaced by a Google ad exec, Jeff Levick.

Armstrong, sources said, announced the moves to his staff tonight, right after he told Coleman about his decision late today.

Also out: CFO Nisha Kumar, who came to AOL in early 2007 from Time Warner, owner of the online unit.

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That was fast.

Longtime–well, five years, which is a dog’s age at the search giant–Google sales exec Dennis Woodside will become VP, Americas Operations, replacing outgoing exec Tim Armstrong, who was named chairman and CEO of Time Warner online unit AOL last week.

Woodside will start in the next few weeks, said Google in an internal communication about the appointment, as Armstrong transitions from Google to AOL.

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With Yahoo board Chairman Roy Bostock reportedly assuring investors and others that the company will have a CEO in place by the end of the year, it seems prudent for BoomTown to initiate an official Yahoo CEO Countdown.

After all, this column had a 100-Day No-Sacred-Cows Vision Quest to mark the time that Jerry Yang said he needed to give Yahoo a top-to-bottom look-see when he took over last summer as CEO.

So here’s today’s update: No Peter Chernin and a lot of thorny issues for other candidates.

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Now let’s return from the land of fatuous deal schemes and half-baked plots to buy Yahoo and get to the most critical issue facing its board right now: Finding a new CEO to replace outgoing leader Jerry Yang.

Sources tell BoomTown that board Chairman Roy Bostock has been asserting a new CEO will be named by the new year.

Only 28 more shopping days until management clarity!

Well, maybe not so much, given there is no formal search committee. But there is a list and a pending AOL deal, so let’s hope for a miracle on 701 First Avenue in Sunnyvale!

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When everyone else has been selling, it seems Carl Icahn has decided to throw good money after bad–as in nearly $1 billion bad–by buying almost seven million more Yahoo shares, according to a regulatory filing.

Why is he doing it? BoomTown is guessing that the billionaire investor thinks he can recoup some of his massive losses in Yahoo, as Jerry Yang prepares to step down and the board, on which Icahn sits, names a new leader.

That’s why my guess is that the choice of a new CEO is likely to be sooner than later, much more Icahn-friendly and strong on operational skills.

BoomTown’s new guesses: Yahoo board member John Chapple or perhaps an ops star like HP’s Todd Bradley.

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BoomTown might have been remiss in my post yesterday on top candidates for the Yahoo CEO job, in the wake of news that Jerry Yang was stepping down, by leaving out several key possibilities.

Yesterday’s roster included News Corp.’s Peter Chernin, Google’s Tim Armstrong, Kevin Johnson of Juniper Networks and also two Yahoo board members, among others.

So here is an addendum to my initial list–all of whom are Yahoo outsiders, the likely choice versus more tarnished insiders.

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