Via VentureBeat, Acquisition Mashup: Google-Microsoft-Yahoo from Shmula is a nice chart listing acquisitions by Google, Yahoo and Microsoft together. Click on any item to learn more about the purchase. I wish there was a way to reduce the font size, so that you could see more of the chart -- or perhaps a way to make it go vertical, rather than horizontal. Still, very cool. Related, see this analysis of some Google acquisitions by Bill over at SEO By The Sea, this list from Wikipedia for Google, this chart for Google from Tristan Louis and this expanded chart based on Tristan's that Philipp at Google Blogoscoped made.
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