3.2.2 beta3 is the latest and greatest. There are a couple of tweaks that are in the CVS tree now that aren't in beta3, but very little. If you checked things out 3 weeks ago, you definitely want beta3. In general, it's easier to stick to an official beta version for a live site so you can more easily get help from the developers.
If you want to check things out of SourceForge just for usage, you need to do a "cvs export" but for that you'll need to use a tag, which is basically the same thing as getting a beta version, since those are the ones we tag :)