I'm sure all of these are well known to you guys, any to add to the list I should check out? This is what I've come across and visit frequently so far:
http://www.jamma-nation-x.com/
http://www.neogeokult.com/
http://www.neostore.com/
http://www.mvs-scans.com/
http://southtown-homebrew.com/...