We actually sort of have something like this already with Obsidian Portal and P&PG. If a game is posted over on Obsidian Portal that is in my area, I recieve a notice about it. Granted, I only get notifications about games that match what I have listed on here at P&PG as being interested in. This has been in place for quite some time now. Our Owner/Administrator, Farcaster, was very far seeing in getting this partnership set up between the two sites. You may want to inquire with him about this very thing expanding to include more sites.
"You go 50 feet and come to a Y."