Play Doom, Doom 2, Heretic, Hexen in Hi-res
 

The Doomsday Engine - An updated engine for all those id games. Looks great, works wonderfully...I myself play in 1680X1050. All you need are the original source files from the games. You should be able to find those with a little creative googling. God, mouselooking is fantastic, and implemented in these games now. (src: Digg.com)

http://sourceforge.net/projects/deng