I run a small community website ( ~100 visitors / 400-500 page views a day) which mainly features "profiles" (biographies with a picture) and an event/birthday calendar. The whole thing is self-written in PHP/MySQL and a bit of a pain to administrate - people email me their profiles, birthdays, events and I enter them into the database for them.
Therefore, I have been thinking of switching to a community system like PostNuke, Geeklog, etc where users can administrate and publish (after my approval) their own data. I have no previous experience with community/portal systems at all though and was wondering if anyone could recommend one? I'd also be curious how heavy those kind of systems are on conueries usage - I only have the "Crazy Domain Insane" plan.