I'm with csgal about Simple Machines, I don't like it at all. It's too un-simple in my opinion., and I just don't like it.

I like phpBB the most, it's easy to admin, and there are lots of ways to use it. I've looked at the CVS versions of 2.1.x (phpBB 3.0), and it looks awesome. It's just as good as VB in my opinion, and it still has its simplicity, even in the admin CP.

I've also used IPB as a user. I do like the feel of it alot, I just haven't used it much. I'll probably play around with it on my computer this summer.

I've also used VB as a user, obviously, and it has lots of features, but from what I hear, it's a bit complicated and complex to administrate...

MyBB looks good right now, I wouldn't be surprised to see it become more known once it's out of it's RC stages. I'm going to play around with it too. It does look nice too.

I still stick with phpBB due to the fact that it's open-source and will have many more features in 3.0. It looks great. I like it as a user and admin.