Despite what a lot of people say, carp are good eating, particularly grass carp and asians. they can be filleted boneless, remove the red meat, marinate, and deep fried. The local outdoors store has me do a fish fry each year for their fall sale, and all the guys working there are the first to hit my fish - they love it. A few here have tried it as well. Gar are also good so long as you don't soak the meat. Cleaning gar can be difficult, but Christine has a tutorial posted.
http://www.illinoisbowfishers.com/gar.html