The Discovery channels are all I watch anymore. Deadliest catch is a great show but I am hooked on a few others that you guys may want to check out.
"The first 48" is my favorite at the moment. It follows real homicide detectives as they scramble to find the killer.
"Modern Marvels" is the most consistent show I've ever seen however. Every episode is extremely well done and holds my interest all the way through.
"The Universe" is great too if you are an astrophysics nerd like I am.
Give me these three shows, and South Park to keep me up to date with the current news events, and I'm happy.