What is speedrunning?

Speedrunning is nothing more than playing a game with the intent of completing it as fast as possible.
People speedrun to challenge themselves, to see a game pushed to the limits, and to get extra replay value out of a game.

Speedruns LIVE[www.speedrunslive.com]
Tomb Raider Speedrun Tips[tombrunner.net]
GamedDoneQuick[gamesdonequick.com]