I just upgraded to release 2.3 for WordPress, named “Dexter.” Seems to have run pretty smoothly, and the new release has a plugin checker that lets you know about the latest versions of your plugins. (Also, integrated tagging! Which I might use at some point, maybe.)
However, just in case you run into the same error I did, mentioning the non-existence of the “post2cat” table, upgrade your Google Sitemap plugin. The plugin checker doesn’t recognize there is a new version yet, and the older one isn’t entirely compatible with Dexter.