You have to buy a membership to get onto the forums, but pas.org is the Percussive Arts Society's page. Mostly pros, then students, and quite a few hobbyists. There's more info there than anywhere else. But it's not for the faint of heart- there are a lot of Mr. Know-it-alls in this business. On the flip side, many of those same Mr. Know-it-alls really do know it all.