Wow, now that I think of it, I have a ton of stuff. I have the "Captain's Plate" from the Franklin mint with Kirk, Picard, Sisko and Janeway on it. I also have 4 pocket watches (TOS, Borg Enclave, UFP, and Klingon Empire). I have some of the original film cells from "Encounter at Farpoint", 90% of all the ST Hallmark orniments. A big cutaway poster/diagram of Ent-D. A series of mini-plates with a host of different scens, from TOS to Voyager. (about 12) I also have a nice 1/2 sheet of the Ent D in the Nexus. I have a tin box of collectable TOS cards, an Ent-D shuttle alarm clock, and a Klingon Bird-Of-Prey snowglobe (it lights up!). I have a bunch of the MicroMachines but I'm not sure which ones. I got the box set with the "All Good Things" ships as a bonus, so I have those plus a handful more.
As far as Star Wars goes I have the TIE Interceptor lego model (the easier of the two to find, the other being the X0Wing, which if you have/know of LET ME KNOW!) I have the original X-Wing game and X-Wing V TIE games (with box).
I have all the Final Fantasy VII characters that made it to the US shore, including a box of Cloud, Barrett, Tifa and Aeris, with Vincent and Sephiroth being seperate. Never found a Yuffie.
I also have all the FInal Fantasy VIII character's. This includes Squall, Rinoa, Zell, Seifer, all those 'playable' characters as well as all the GF's. (Cerebrus, Diablos, Behemoth (I think thats it) and Ifrit, Shiva, and one or two more maybe).
I have 7 of 8 of the Metal Gear Solid characters (missing Vulcan Raven, again if you know of it/have it let me know!)
I have all the Evangelion figures (like 7 I think).
There's probably a few I missed, but thats like 90% of my bedroom. Action figures (hung in boxes) and posters.