Who's going to get bought out next?

Wondering which Web 2.0 company is going to cash out next? So are we, and so was Aidan Henry.
Aidan wrote up a list of the biggest Web 2.0 companies that got bought out over the past year, and a list of the biggest movers that are highly targeted leaders. Among them are market leaders like Digg, Technorati, Netvibes, SimplyHired, 37 Signals, LinkedIn, Ning, and SixApart.
So what will the next major aquisition be? Facebook said it's not interested, and 37 Signals has been trucking along building successful applications for some time now so it's hard to tell. But these companies hold a lot of interest for larger traditional media ventures like News Corp, or top technology companies like Yahoo and Google.
Given acquisition track records, companies that have been bought out by larger companies usually enjoy an increase in exposure, customer base, and all of the technology developments they can handle.....most of the time. With buyouts often come the unknown. Yahoo scored big with del.icio.us and has taken some time to redevelop the popular bookmarking site, but Dodgeball seemed to have sunk when Google took it over and neglected it.
So what's your bet? Who would you write in as the number one spot for the next major acquisition?
