In 1997, id Software release the source code to the original Doom games to the public domain, spawning a slew of source ports adding all sorts of new and more advanced features to the ageing classic. Now, the Doom Legacy team have managed something that was considered impossible: added per-pixel lighting and normal mapping to the now 14-year old game engine. Check out the screenshots below or visit the forum for more information.
I don't think this is enough for me to play through the whole game again. On second thought I installed Doom3 the other night and have had a great time playing it with a new computer and the mods that are out there.