From Niall Kennedy's Weblog...WordPress 1.5 is out. Should've known as I just installed the 2/14 nightly build on my test machine. Upgrading seems to be fairly straightforward, though.
WordPress 1.5 Strayhorn arrives: WordPress 1.5 is now available for download. If you are upgrading you should follow directions and "reward yourself with a cold soda and some candy." If you are in the San Francisco area Matt Mullenweg is hosting an upgrade party tomorrow night.