After reading this article:
about the departure of Newman/Haas/Lanigan Racing to IRL, it looks like that might be the death knell for Champ Cars (used to be CART). The sad thing is that in the 80's and early 90's, CART was considered America's F1 series when Bernie and the F1 group snubbed the U.S. and made it one of the only major countries without a gran prix. CART and later Champ Cars were always pushing the envelope with not only performance but technology some very innovative ideas were fostered in CART/Champ Cars.
I'm sad to hear this news 'cause while TV coverage and support for Champ Cars has waned over the years, it is still one of the most exciting open wheel series to watch. The IRL on the other hand is more like open-wheel NASCAR and stifled by rules, ad-nauseum.
I hope Champ Cars don't go away but I don't think that there will be any name big enough to step up and fill Newman/Haas' shoes. Then again, Newman/Haas has the potential to wipe the floor with their competition in the IRL so it might be interesting there. We'll see I guess.