There is an excersize vid thats pretty old its a Cindy Crawford workout There are some parts in the workout that are dangerous and hard on the back but her abdominal workouts are great. Go on youtube and look up cindy crawford workout (not the Next Challenge one ) and try to find the part for the abs
go on youtube and type in passionforprofession on the search taps they have workouts for every part of your body and really good one for your abs i been at it for 3 weeks now and i can see it coming inn
I don't know any websites. But you could try searching for Taebo videos or do some sit ups, push ups, leg raises, crunches.
bodyrock.tv has alot of good workouts for abs and verywhere else