I think YouTube, and online video mods are very important since embedding videos in post make it easier for people to view videos without leaving your forum to go to YT by clicking a link.
Smilies like :hammer: are also great since they are fun to use in posts. h34r::
Everything that is currently a mod at my current host, and then some.. I'd want the transition from the old forum to the new to be as smooth as possible..
h34r::
