Have you ever heard of the DVD called "Hip Hop Abs"? You would get some great ideas from there...all standing ab exercises...Don't let the "hip hop" part fool you...a lot of these moves could be used in a traditional muscle conditioning class.
I'm another fan of Turbo Jam's Ab Jam! that stuff is amazing! I always get DOM's, especially after the standing core work in Cardio Party 1!! That one is KILLER on the abs.
The other good one is Kickin Core with the ball...there is good standing cardio core work, and then core stuff with the ball.