Pro Skater
Cheats and Hints, Reviews and Previews, N-Gage Arena, Neoseeker: Tony Hawk's Pro Skater
Pro Skater 2
Cheats and Hints, Reviews and Previews, Activision, Gamer's Hell, The Parks Page, Tony Hawk 2 GBA, Tony Hawks Pro Skater 2, Tony Hawks Pro Skater 2, Tony Hawks Pro Skater 2
Underground
Cheats and Hints, Reviews and Previews, Alias Clan, GameFAQs, IGN, Open Site, Tony Hawk's Underground
Jed's THPS Videos
Video clips [avi] of combos in THPS 1 and 2. Also includes message board.
OnlineSkaters.net
Community site for the Underground series. Forum, screen shots, tournaments, and downloads.
PlanetTonyHawk
Information, FAQ, level guides, move and transfer lists, codes, glitches, downloads, and forum.
Tony Hawk Forums
Discussions on multiple games in the series as well as related topics.