My equally geeky Trek obsessed brother sends me this link knowing it will become a target of obsession at least for a day or two. BEHOLD, THE STAR TREK PROP COSTUME AND AUCTION AUTHORITY.
A cornucopia (not a gigantic tin-foil cornucopia mind you) of authentic Trek related items for the wealthy Trekkie.
This site also provides production trivia on a daily basis, the latest having to do with the make up involved in aging the cast for the episode "Deadly Years" (especially known for its wealth of over wrought ham acting, not only from Shatner, but DeForest Kelly) from which the picture accompanying this post originated.
(But, I sure do wish I could afford that Doc McCoy "hypo" that's on auction at the site if you scroll down a bit...)