Here is a quick list of the recent software releases that we think are pretty big in their area. If we missed something else, be sure to let us know.

JDK 1.6.0u10: faster startup, better desktop integration
OpenOffice 3: MS office 2007 compatible, a whole load of other improvements
OpenSolaris 2008.11: Time Slider, Great new desktop software (Songbird)
Python 3: 3 years in the making, long standing bugs fixed, better unicode support
Mysql 5.1: Big performance improvements

All of them have had previous beta or release candidates but now that they are all in their final release stage, you can use it in production!