Assuming the site exits beta in a few months, what kind of logo should it have?.
If we've got room, I'm all for a toppling tower made from a full set of polyhedral die: d20, d12, d10, d8, d6, d4.
How about just a d20?
(I like that stack of d6's.)
If it doesn't turn out to be that one, a die with a questionmark on the top face might be good.
A stack of d6s toppling over similar to the stackoverflow logo.
(Answer added at request of commenters)
I think a dice-tower of assorted dice toppling could be more fun. But we don't have that many pixels to choose from.
I think about Papers, pencil and dices.
Not logo design, but: if the current look and feel with the graph paper just had a bunch of rooms on it... might be too D&D/fantasy specific, though.
Alternately, I could go for a hexahedron, tetrahedron and icosahedron (d6, d4 and d20) arranged like the boxes in gamedev.stackexchange.com's logo.
I'm going to say a d6 being touched by a glowing wand. Yeah, the wand is fantasy-centric, but probably we can admit that so is the hobby.
Honestly, I would really rather the stack of different types of polyhedral dice, but this logo has to scale down to a 16x16 favicon. We have very little real estate to work with when you take that into consideration.