The UT mission packs that were released by Epic had recieved a lot of praise-but they were free.
By the way Halo:Combat Evolved PC Demo is up for grabs at the Microsoft site. A warning though: The game will run quite slowly even on the most powerful PC if all the graphical settings are turned to max and the resolution is set above 800x600. So you best bet is to run the game at 800x600 and lock the FPS to 30. The game engine can be blamed for this. Graphics are quite good(just as expected).
The demo can be downloaded from
http://www.microsoft.com/games/halo/downloads.aspIf you have played Halo for X box then you shouldn't buy this game-unless money holds no value for you, in which case you can give some to me.
PS: Spriggan do u really think that ppl who purchased the originaly AOM should pay for the "12 new god powers, 15 new human units and 10 formidable myth units"?
Vikram