crossfit.com – Emphasizes intense workouts and functional strength

Gymnasticswod.com - Nothing but bodyweight exercises

Mobilitywod.com - Like stretching, but better

iwantsixpackabs.com - This was the one of the first routines I used when first starting to work out at home.  I liked it better than P90X. On occasion, I still use some of these routines.

deepsquatter.com – A 12 week Olympic weightlifting routine for beginners.

Funk Roberts 4 week workout - A 4 week spartan style workout.  Incredibly hard and worth a try.