I voted Nintendo because my favorite systems are made by them: DS, Gameboy, and SNES.
...but, Black Isle was my favorite game company.
1. Fallout
2. Fallout 2
3. Baldur's Gate
Seriously, those games had me so addicted. Fallout 1 is my favorite game, ever. Open ended, great story, post apocalyptic, well designed, superb soundtrack, very immersive, harsh dialog. Too much to say, its just my favorite game. If you havent played it, do yourself a favor and try it (most stores carry 1&2 in the bargain bin for about $7 anymore). Turn-based post apocalyptic RPG, designed for all types of rpg players - the game can be played through as an action combat type, sneaky type, you can even win with just dialog.
Great game designers, all their games have good soundtracks, all their games have good replay value. yah. Alas, interplay killed Black Isle, thus ending my hopes for Fallout 3 to destroy my real life. Best RPG's came from them, in my opinion.