The wee hours of the morning saw the release of WordPress 2.0.3. This release fixes a few bugs that have been identified in the past three months, and it also adds some security enhancements.
If you would like a smaller upgrade package, Mark Jaquith has a zip file that contains just the changed files. It’s unofficial, but I’d trust Mark.
Also, if you don’t regularly check your WordPress Dashboard to see when new releases are available, you can also check the project status on Freshmeat.net. Freshmeat lets you subscribe to email notifications on projects, rate projects, etc.