First, and probably the most impressive of them all, is this bit of awesomeness by Edward and Antoni Frys of European Cake Gallery:

Ed sent this in last week, explaining that as a Trekkie it's something he's always wanted to do. (I'm pretty sure he was referring to the construction of the cake, though, not his attempt to eat his way through the saucer section.) The support structure took him and his brother 3 days to weld, and lest any of you should question his Trekkie status, he also tells me the ship design is the NCC-1701 "refit" used in the first three movies. Ok, Edward, I think we believe you. ;)
Ed also sent along some progress shots, so you can see all the work that went into this masterpiece. First, the body set in a specially carved foam support base:

And the nacelles, made from a mixture of Rice Krispy treats and white chocolate:

And lastly, a nice shot that really shows off the detail work on the saucer:

And while we're geeking out here - you guys don't mind, do you? Yes? Well, tough cookies - I have to share with you the fantastically geeky wedding cake topper from Trekkie/Wreckie* Storm:


Think that's a bit odd? Then clearly you don't know any Trekkers OR Trekkies. Oh, and you haven't seen the group wedding portrait:


And Maggie A. sent in this simple-but-elegant groom's cake:

Here's a whole spread found by Nina B. at Cakery Bakery:

And lastly, I'd be remiss if I didn't include the cake Duff made:

That's all I've got for now, but I'm sure there are more Trek Sweets out there. If you have one you'd like to share, send it to me at Sunday Sweets [at] Cake Wrecks [dot] com.
*And that really is an excellent combination, if I do say so myself.