It's already been done for Counter-Strike, so why not for Warcraft? A team of homebrew devs came together and brought us Warcraft 2D PSP - three guesses what it is. Obviously it's not as feature-packed as the real thing, but it's a good start to a 2D portable version of the game. Here are the features as described by the dev notes:

• The game is played in real time, you're a single character
• The game is played in 2D
• You have the choice between 2 teams: Orcs and Humans
• The game is playable online therefore only player against player, an artificial intelligence may be present in a new version
• Different classes of people will surely be added in a new version
• The game is now in English
• A system of experience points and levels is available.
• If the game appeals to many people, developers will be thoroughly inside and create a persistent universe with a server.

I hope these kinds of 2D remakes catch on. I'd like to see a 2D homebrew of Mirror's Edge, like the flash game, or Assassin's Creed. Anyway, Warcraft 2D PSP is written in LUA, and the programming team - composed of UnlimitedX, Darksymphonie, Azog, and Sox - are actually accepting help to develop the game.

Download: Warcraft 2D PSP v1.0 Beta