Competitions, Records, and General Stats
WCA - Official Stats
Speedcubing - Official/Unofficial Stats
Speedcubing Forums
Speedsolving - General (Biggest) Forum
Twisty Puzzles - Puzzle Builders/Collectors
WCA - Official WCA Discussion
Yahoo - The ORIGINAL forum (super old-school!) xD
Hardware
SpeedCubes.net - Everything you need to know.