[Fig.] Comparison of acquisitions by Microsoft, Google, and Yahoo! in 2007

This summary is very good, but it could be more comprehensive, including the scope of acquisitions, without considering the acquirer, and ranking by the scale of the acquisition and the time it took. For example, in map mapping, we have long believed that this field is a key component of the emerging Internet operating system, and we even dedicated a conference to it (Where 2.0) —— we have already seen Google acquire Keyhole, AtLast, and Sketchup, Microsoft acquire Vexcel and GeoTango, Yahoo acquire WhereOnEarth, Nokia acquire Navteq, and Teleatlas being acquired by TomTom or Garmin.