One Must Fall: 2097.. yeah!
Guys who want to play these old games:
http://www.the-underdogs.com has a TON of abandonware/freeware/shareware (I think this is OK to post since it's not really commercial games). They also have reviews and stuff of commercial games with links to where you can buy them for cheap.
A great program to emulate dos is called dosbox:
http://dosbox.sf.net . They even have a database of games and how well the games play in dosbox. Very cool.