I've just started using podfitness. You can pick a workout that you want and mix your own music to go with it... it's great for me because music really motivates me. However, most of the workouts require at least a set of dumbbells at home. They have yoga and mat pilates though, if you're into that!
If you don't have any equipment, I would recommend maybe doing stuff like pushups, jump squats, lunges, planks, side leg lifts with a plie squat, etc...
As for the motivation, I like browsing nikewomen.com! They have some good stuff on there.