Perfection, here we come.

WU-TANG FPS is a group dedicated to helping players grow their potiential, leading them ontop of Leaderboards, and possibly ontop of the world.

The plight of this group isn't exclusively limited towards FPS itself, but a few other genres (namely, RTS) who heavily rely on mouse speed and keyboard dexterity

Look at the links to start off.

Aim400kg - Improve your aiming and mouse dexterity[aim400kg.ru]
Missionred - A site dedicated to mouse aiming/dexterity[www.missionred.com]
Typeracer - Improve your Keyboarding Dexterity here.[play.typeracer.com]