What I'd personally like to see is mail notifications that appear more like "real" mail.

For example, I use Gmail to read my e-mail. Gmail creates little tabbed conversations, so you don't have a million seperate messages for each thread. It works wonderful with regular mailinglists that don't use a web interface. It mostly works with this forum too, but on some threads it doesn't. I hope vBulletin behaves more like a 'real' mailinglist (but also as a web forum at the same time), since I mostly read this stuff in my inbox.

But really, the interface is not a big deal. I like this forum because of the content and the people who contribute here. It's everything I want in a photo forum: it's technical (but not too technical), free of spam and full of friendly and knowledgable people.