Sweating Buckets is an "easier" Spinerval. That said, it's a decent workout. I use it for recovery days.

I love the Iron Girl DVD and try to do it once a week. It's more of a circuit type workout---on the bike and then off the bike for strength work. The first strength segment (push ups then bicep curls into overhead presses---repeat three times) is a killer. It makes you stronger, even if you already are into strength training.

By the way, I love Bending Crank Arms, too. :-) It's a great leg strength workout.