I recently downloaded a pdf RPG from DriveThruRPG called Warrior, Rogue and Mage, and it looks to be a great game. It is a rules light, classless system with game mechanics that use dice roll checks based upon attributes, skills, and talents. There are three attributes, Warrior, Rogue, and Mage, which allow for a flexibility in character design and development not found in many games. Characters are fluid and free, not confined to classes.
Best of all, the rules and first supplement are FREE! You've got nothing to lose by checking it out. However, free doesn't mean cheap in this case, the pdf is wonderfully illustrated with top notch artwork. A second, background free, printer friendly version is also included.
To become familiar with the game mechanics, I plan on running either a random solo adventure using the solo dungeon matrixes from The Strategic Review (D&D), or possibly a run through Arena of Khazan (T&T). I've already created a character and am eager to get started. Once I've learned the game, I'll dig into the included setting notes to design a GM adventure and find a small group to play it.
You can download the Rule Book, as well as the first supplement for free here: