Defense of the Xel'Naga (D.O.T.A. for sc)
(Original by General_Raynor, now officially continued by me)

If you don't know D.O.T.A.: This is a map similar in playing style to Hero Wars but created and balanced with much more passion.
In the beginning select one of 5 heroes per side (Terran or Protoss, Zerg are available as computer controlled mercenaries), each with his own style of playing, spells, strengths and weaknesses. (There are no weak heroes, only bad strategy.)
You need strategy, good knowledge of all spells, extra units and items and most of all team play to win here.
Fight the enemy heroes, kill masses of spawn units and wear down your enemies' defenses to make your final goal vulnerable: The Xel'Naga temple.
This map has one specialty: You need to support your own troops (be near enemy spawn) to gain XP. Killing spawn will not do anything.
But you are rewarded for hero kills (which is still glitchy sometimes - when I've got time I'll work that out).