Microsoft Office SP1 available for download
Office 2007 SP1 packs a bunch of bug fixes, including the infamous Excel calculation bug. Of course, that bug was already fixed in October, but like all Microsoft Service Packs, this one includes all the important hotfixes since Office 2007 was first released as well as a few new goodies.
The update also packs some stability, security and performance updates. You can read the complete list of changes in the Service Pack 1 whitepaper.