I currently have 345 games in the collection in my profile.
It's missing Sega Superstars (PS2) (supposely "already in the database"), and Super Fantazy Zone (VC) (no box art yet). I also most likely have more PC games than listed.
The collection is also missing my 2 old Game&Watch : Donkey Kong II and Mickey & Donald. VGChartz database also doesn't have the Amstrad CPC on which I had tons of games (a lot of them "pirated" copies though). Finally another missing old system is the VIDEOPAC for which I should have around 18 games.
As for the games I intend to add to my collection in the future :
Wii :
Samba de Amigo
de Blob
Wario Land: The Shake Dimension
Mega Man, Mega Man 2 (VC) (I've never played any Mega Man game before, the hype for Mega Man 9 makes want to catch up with those old hits)
Guitar Hero: Aerosmith (maybe)
DS :
Phoenix Wright: Ace Attorney Trials and Tribulations
Apollo Justice: Ace Attorney
Arkanoïd DS (maybe)
Contra 4 (still not announced for Europe, I'll have to import)
Kirby Super Star Ultra
Trauma Center: Under the Knife 2 (import if doesn't come to Europe, like New Blood on the Wii doesn't seem to come 
)
PC :
Spore
Left 4 dead (maybe)
Starcraft 2
Diablo III
Duke Nukem Forever 
