Gotta say, you guys have got some great collections!
I posted most of this on the "Systems You Own" thread but...
1) Final Fantasy II Wonder Swan box set. It even has the cell phone strap.
2) Kenshin Dragon Quest. It's a sword and shield that plugs into your tv. The shield is like a wireless device that sends a signal to the sword, like the Wii and a Wiimote.
3) PC-Engine CD. Even tho I haven't gotten it to full work yet!

4) Sega CD-X. It looks like a space ship with the 32X sitting on top of it.
5) My Japanese games. Stuff like Bahamut Lagoon (cib), Lady Stalker (cib), Fantastic Night Dreams Cotton (cib), Phantasy Star Adventure, etc etc.
6) Dragon warrior I - IV on the NES, including complete DWI & III.