Looking for the best Home-Brewed Rules

Hey, Twisted Euphoria here. I'm asking around for the best, or just makes the game slightly that much better homebrew rules. Slight modifications that improve the flow of the game, anything of the sort. So, what are some that you have embraced?

Is this a game you are GMing? if so which system?

Pathfinder

<a href="http://dungeons.wikia.com/wiki/E6_(3.5e_Sourcebook)" rel="nofollow">http://dungeons.wikia.com/wiki/E6_(3.5e_Sourcebook)</a> E6, you can google E6 pathfinder for some talks about adapting it to that rules set. Basically it stops 3.5/Pathfinder at the sweet spot, where the math works best, where fighters get a second attack, wizards and sorcerers get access to 3rd level magic, HP stay reasonably low, etc...You never gain levels after 6th but keep getting feats and a few other things.