WordPress v2.0.1 is now available with over 100 bugs fixed since v2.0 was released about a month ago. This is looking like a very stable release and should be a great improvement over v1.5.2 with all the new features added in v2.0.

If you want to help out development of future WordPress versions then you can head over to the codex to sign up under areas which you feel you can help out.