Playpen has now been upgraded to WordPress 2.0 largely without pain. In fact, without any pain at all, although I was particularly careful to back-up everything possible and check the back-up. Lorelle has an excellent collection of tips and links about how to manage the process, but it’s very easy.
Matt’s list of plug-ins that do and don’t work is not only useful for the upgrade, but also as a convenient list of plugins.
I’m enjoying the new interface too so far, but still finding out some of the hidden goodies in nooks and crannies.