Now it can be told. Cul de Sac is being animated for cellphones by Ring Tales and Andrews McMeel has loaded an episode onto YouTube. They've also put up one for Argyle Sweater.
Apparently it can't be told. They took them back down a day later - although Michael Jantze of Jantze Studio wrote in to say that he worked worked on it. Jantze used to do a strip/book called The Norm which I enjoyed a lot.
Updated again - Alan Gardner notes that Ring Tales, not Andrews McMeel has the distribution rights to the animation.