Free to play, free to join.
The home of NeoGAF's Heroes of Newerth community.
For new HoN players interested in joining the GAF clan in-game, type /join Clan NeoGAF and someone should be around to send you an invite.
For new players: http://www.nigmanoname.com/prodex.html - The Prodex is a compedium that gives you stats, builds, and general tips on how to play your favorite heroes.
Also check out www.honcast.com for special events and tournaments in the HoN community.