A 'What's New' feature for new content would be cool! How many people noticed that there is a new article up on the Climbing/Articles section on friction knots? I wouldn't have noticed it if I wasn't looking for my article on climbing in Chamonix.
Also, I know it takes alot of work and focus to get the infrastructure set up but now that the infrastructure seems to be here, there is a dearth of content, particularly in the new forums.
IMHO it is content that draws people to the site and the discussion boards that keep people returning.