Musicals: I actually like it when people burst into song for no reason whatsoever. However, I know that I shouldn't so this gets added to the list.
Romantic Comedies: I know that a lot of them are flat, wet and whippy little pieces of fluff marketted to women, but I like them all the same.
Comic Book Hero Movies: I am not a huge fan of all comic book movies, but I really like some like Spider Man. However, at times, they can be really cheesy.
Disney: I consider this less and less a guilty pleasure, and it's not on my list per se anymore, but when I really started to get back into Disney around two years ago, I felt disgusted with myself as I thought that I was liking "kid's stuff". However, with the help of boards like this, my self confidence has heightened.
The Simpsons on DVD: I bought my first Simpsons boxset last month (pathetic, I know

TV Shows that look into celebrity lives: I despise some of the aspects of lifestyles of the rich and famous, yet I find them endearing enough to watch bland and gossipy documentaries on them.
Motown: I have been listening to a Motown CD compilation all week. Somebody should tell me off.
Intenet: I spend a lot of time on the net and I feel guilty for doing so.