In August 2007, IBM acquired WebDialogs, a leading provider of Web conferencing services that make it easy for companies of any size to collaborate beyond the corporate Intranet.

Photosynth, based on technology Microsoft acquired in 2006, is entirely free, and it's entirely based on the Web, at photosynth.net (where it will be launched at midnight EST Thursday).

In late Spetember Adobe acquired Waltham, Mass.-based Virtual Ubiquity for an undisclosed sum, and in doing so officially entered the web office fray.