I will generally like anything except most rap. Doesn't mean I'm "in the know" about anything except most rap. I am prejudiced against rap and I know this, but I don't care. 
  
Generally I would say the music I listen to most is stuff that is some form of rock, with some exceptions. Pearl Jam, Screaming Trees, Blur, The Pixies, Mogwai, Eels, Shaman, Modest Mouse, Alice In Chains, Sufjan Stevens, Incubus, Beck, Pantera, Iron Maiden, Soundgarden, Audioslave, Finntroll, Broken Social Scene, Foo Fighters, Metallica (everything except St Anger, I don't mind their forays into post-grunge), Sonic Youth, Skyclad, The Shins, Gorillaz, Daft Punk. Also,  
  
I must admit I listen to some Nu-metal/post-grunge bullcrap. These would be Godsmack, Disturbed, Orgy, Puddle of Mudd and Staind. I am not ashamed. I am comfortable with liking this. I am enlightened. 
  
EDIT: Also, Deerhoof, Loreena McKennit, Bearsuit, The Flaming Lips. 
  
Basically, any rock music that is considered 'poser' and any indie music that has apparently sold out.