I'm on Plex .8 because Plex .9 didn't allow delete. There was a shitstorm in the forums about this, and it's been implemented, so I never upgraded. The other thing I hated about Plex .9 was the UI. I really liked the "browse by filesystem." I'm considering giving XBMC a try again (I started with that and went to Plex when they had much better Mac support).
Nice... I'm considering switching over to XBMC for a week or two to see how I like it. I might write a blog post to compare the two soon. Moving this week though, so it might be a while.