Resources

Musictheory.net - All things Music Theory: Note Identification, Keyboard Note Identification, Interval Identification, Chord Identification, plus much more. 

Metronom.us - Best free metronome available. 

Tapspace - Percussion Music Source

C. Alan Publications - Percussion Music Source

Pocket Percussion - Ton of fun practice resources.

Vic Firth - Great resource for rudiment practice as well as videos on all accessory instruments. 

Steve Weiss Music - Number 1 site for percussion equipment and music. 

Free Drumline Music - Drumline cadences for all levels.

Lot Hype

Percussion Arts Society - Primary organization for all things percussion.

Black Swamp Percussion

Mostly Marimba

Malletech

Snarescience