The (many) Rules of the Game

I mentioned here before that I have been looking at Green Ronin's True20 RPG rules. In addition to True20, I'm reading the rules for Pinnacle's Savage Worlds (which will also power their upcoming Solomon Kane RPG) and Politically Incorrect Games' Iron Gauntlets. Each of these have huge followings of fans on the internets. I'm trying to get the gist of each and determine if they might be a good fit for the playing styles of our groups. Have a look at the sample rules here and here (haven't found a free sample for IG). Sometime soon, when I get my basement cleaned up, I'd like to playtest these rules and put them through some goober stress testing.

Edit: Forgot to mention Mongoose Publishing's RuneQuest 4th Ed. The SRD and Developer's Kit is available here.