What kind of alternate "games" are there in Starcraft 2? In the same way that WC3 spawned DOTA, what has SC2 spawned so far...?
There are already almost all the custom maps that were available in previous Blizzard games, though usually a little less advanced and with a SC2 theme instead of a WC3 theme.
There are two or three DotA Versions, a lot of Tower Defense maps, Nexus Wars, Income Wars, some Racing game (http://www.youtube.com/watch?v=ahbQNptHCi8), some First Person shooters, etc.
I don't think there is anything "new" compared to WC3, but SC2 is still quite young