I don't really care about the speculation on what Google might buy next. Heck, some of the company's purchases have been opportunistic rather than planned (Deja, Blogger and probably Dodgeball), so saying what's "sensible" or predicting what's next is guesswork, at best. But Who Will Google Buy Next? at Kuro5hin has a nice rundown on what they've bought already. After what you bought, you can read the sensible acquisitions and "left field" ideas, then go on to agree or disagree in the comments below.
Introducing SES Online
Want to view one of the sessions you missed or listen to an especially informative presenter a second time? SES New York sessions are available for purchase on ClickZ Academy's new e-Learning site. SES is now Online!