Here are some suggestions (some have been mentioned by other members)
1) Edit, delete posts
2) Watch topic
3) Some data about members like Date registered, number of posts, 'reputation' etc.
4) Attachments
5) Quick reply (for people who are having 'slow' internet connection like me, its good that we can reply a topic/post without having to reload the whole page.
That's all I can think of at the moment. Thanks 
I definitely agree with the rep system, where people can get repped or negged, but rep-abusing may pose as a problem, so we would all have to make sure that something like that doesn't get out of hand. I think we need a rep system though, it would deem useful in my opinion.
I think we should be able to edit our usernames, this one "Necksmasher" was made up when I was about 13..lol. It sounds so unprofessional, and I don't know what to do

lol..
But anyway, I think we need a much stricter 3D gallery, like the old 3DK had, no more letting 9/10 submissions make it in. We also need a very active group of people to run the forums and maintain the integrity and professionalism. We also need a 3DK newsletter (do ya'll even have one of those?..I can't quite remember), and do alot for the CG community (ie: interviews, good tutorials, product reviews, major art competitions, etc.).