Challenging Ab workout youtube recommendations?

cleotherio

I've been doing P90x for about 6 weeks. I'm totally bored with Ab Ripper X that I'm supposed to do 3x a week. I'm up to doing all the exercises without any breaks. I think it's time to switch up the routine a couple times a week. I'd like something about as challenging as the P90x workout; just different. I don't have cable or on-demand, so I'm looking for something I can get on youtube or other on-line site.

I know I can make a list of exercises and just do them, but I like following along with a video. It keeps me going at a good pace and I'm less likely to give up too early.