Geeks of Doom offers up some wonderful examples of Doctor Who-themed costuming at DragonCon, which just wrapped up in Atlanta. I really like the dress that GoD calls the best TARDIS dress ever:
Mostly because that guy looks more like the Doctor he’s imitating than any other cosplayer I’ve ever seen. Though check out this Donna Noble, too.
(If you stumble across a cool Doctor Who thing, feel free to email me with a link.)