Well, before we all run off to join PETA (People Eating Tasty Animals), let me put in my wish-list item:
Add the functionality that allows you to quote multiple posts in a single followup.
I know there is a version of vBulletin that supports this -- take a look at the
Philadelphia forum on City-Data, for instance.
Put me down as wanting a true blog on Phillyblog too -- either a bunch of individual members' blogs, or a group blog, or both.