A few years ago I put together a system to target new players while keeping the system free and open to regular RPers. I focused on simplicity and speed. The idea was to make a game simple enough that it could be casually played during lunch hour. I call it Simple System.
(I have the rules set up in a wiki format which helps to organize things.)
The System has gone through a lot of testing and revision and I'm pretty happy where it is, so I wanted to post it here for people to take a look at. Character creation really takes only about 2 to 5 minutes, which lets new players jump in quickly, even halfway through an already running game.
I also addressed a lot of elements of other systems that I always found lacking. Explanations of this I've separated out into an advanced reference for those interested in the thoughts behind the mechanics.
The system can be very combat heavy if the players want. I wanted to bring back the classic war-game feel to RPing that was there from the start. However there's a lot more focus on role playing. The rules really just exist to resolve combat. After that I leave it up to the players and the DM to focus a lot more on role playing.
The DM will have heavier reading than the players, but not much. There's about 9-10 pages of rules governing the rest of the game. Most rules are extremely simple and once you run through combat once, it will be a breeze.
I run game's often on OpenRPG, which I'll detail in a post in the appropriate forum. I take advantage of the easy dropping in of players and NPCs all the time. I find it helps me get out of my own way as a GM.