The newest release for Wordpress 2.3 is available for download. It is still in beta so be aware that some bugs are still being worked out. I would wait for the stable release.

This release is going to break some plugins so please check before you download:
WordPress 2.3 Plugin Compatibility List

I found an article that I think you will find helpful if you want to click on over and give it a read.
10 Things You Need to Know About WordPress 2.3