[Zope] Killer features for a user group site?

[Tue Wennerberg]

Hey

My question is: What are the best features for a user group website?

I'm working an a site for the local Zope user group. I want it to keep 
it simple and easy to use. Furthermore I want to actively involve the 
members for content-contribution.

Therefore I'm concentrating my efforts on the following elements (in 
order of importance): Mailing lists, meeting announcements, a few small 
introductory articles and news items.

Are these the best features? Are there any better ones?

Sincerely,
Tue Wennerberg