– Spaces are going to be replaced with hyphens by default instead of underscores. Existing tags aren’t automatically changed; but if you want to, there’s some SQL here that will do it for you.
– Prefixes and suffixes for auto-tags had a dumb bug which I’ve fixed (:
– In wordpress 2, tag names with apostrophes are problematic. If things are broken, try renaming those tags.
– There’s still work to be done with special characters.
– I’m still not sure about .htaccess/rewriting issues in wordpress 2.