Feast of the Behemoths

There's no doubt that the three giants of the online world are Microsoft, Google and Yahoo. What they get up to matters, so tracking what they're doing in terms of acquisitions, say - and who they're doing - is a fruitful activity. The problem, is keeping track. Enter this rather nice draggable timeline, which shows who did what, when and to whom. (Via John Battelle's Searchblog.)