I'd rather see a forum or a wiki than a Google site, honestly. And, I'm a fan of Google sites.
Y'all welcome to use the Year of Living Free Wiki
to host any Apocalypse World
stuff. Technically AW doesn't fit the site's requirements, since it's both closed and commercial -- but it's my site and I happen to like AW!
I would like it if you released any custom moves under an open licence, but I'm not going to make you. Check it out here.