A few people have put some photos from the Nebula Awards up on Flickr (including Cory Doctorow). Lots of people in dinner jackets, but it's always interesting to see pictures of authors you have never seen, then you can go "wow, I never expected them to look like that!".
Except when you meet William Gibson and then you go "Wow he's exactly like I expected him to be!"
Or when you meet Terry Pratchett and you go "Wow! He looks like he should be in Doctor Who!" (Although Christopher Ecclestone has set the expectations somewhat higher, sorry Terry).