Messages

The avoidance of email altogether, and a popup window while a person is browsing the forum so you can chat in a more realtime way if you happen to catch them online.

It's not like I really need that stuff for MY forum, barren wasteland that it is.  However, it's certainly not a redundant feature.

I'm trying punbb out now.  My first impression. . . It seems very minimalistic and doesn't even have private messages (It has "mods" but they are hard to install, and no luck so far)