The design is very nice, very professional looking, clean, and it allows the content to be focused on.
It does fall apart in some user profiles where the user uploaded images that are wider than the area allotted for them, so look into a solution for that.
Here's an exmaple:
gagla - View Profile
Something is also funky on your search page; some of the radio buttons aren't aligned with the text content (Firefox Mac 2.0.0.
and I wasn't thrilled to have clicked "More..." on the bottom of the "Featured People" sidebar to have taken me to the search page. I was interested in seeing more featured pepople; maybe finding out WHY they are featured (are they popular? do they have a special talent? etc...).
You've also got 75 XHTML 1.0 Trans validation errors; I would look into that.
While you're knee deep in XHTML, why not ditch the tables? With such a clean design, they're not really necessary and may interfere with people wanting to access your site from something other than a computer (an iPhone, for example). I bet that would help with the layout breaking with large images I mentioned above.
This site has a nice look and feel, an interesting concept, but needs some technical 'tightening of the screws'.