Angry Video Game Nerd - at first I found this to be silly with its excessive cursing and simply terrible bits that take place outside of the game reviews. Somehow, the show has grown on me to a point where I've likely seen every episode made 4 times now. To those who don't know about AVGN, I'd recommend searching out the Silver Surfer episode (my personal favorite), or other gems like Friday the 13th, and pretty much any 2-3 part episodes on old consoles like CD-i.
The cartoons of X-men and Batman: The animated series. Having grown up with these classics I tend to return back to watching my DVD collection about once a year. The same can also be said about Columbo movies...for reasons I can't explain I find them great as background noise.