FIRM (Fiske Independent Race Management) - Established in 1986, FIRM is the second largest race promoter on the east coast. Comprehensive Racing is a member of the Grand Prix Racing Series, placing second 2 years running ('05 & '06).
Active.com - Resource for all sporting events (tri, du, bike, run, etc) registration, free training plans and work-out tips, and calendars.
IRONMAN North America - IRONMAN series events and registration, training tips and nutrition for full and half iron distance racing.
TimeOUT! Productions - Triathlon Series in MA and Southern VT.
TriFind - American Triathlon Calendar is the largest listing of multisport events in the country.
Cool Running - Resource for running event registration, calendar and results.
BikeReg - Resource for bike event registration for events across the country
MapMyRun - Resource for calculating distance and climbing of running and cycling routes.