So this just shot to the top of my reading list:
The Guardians RPG, by David Pulver and Thomas Denmark.
It features some grappling rules that riff off of the material Doug and I wrote for Tim Shorts' zine, The Manor.
I'll try to read it through and get a review of it out on the blog. I'm really curious to see the final version of the modified grappling rules, and to see how the authors turned very old-style D&D into a superhero game.