I'm into everything. My two favorite singers of all time are Cher and Elton John. I know, I know... Cher isn't the coolest music to be into, but she's awesome. And Elton John's a legend! I was lucky enough to see them both in concert last year and they were amazing.
Other than that, I'm completely into rock. When it comes to the newer stuff I love Blink 182, Green Day, The White Stripes, My Chemical Romance, All-American Rejects, Fall Out Boy, The Darkness, The Killers, Weezer, Reggie and the Full Effect, Taking Back Sunday, From First To Last, The Starting Line, Morningwood, Aiden... all that stuff on Fuse.
I'm also a HUGE fan of classic rock. I love Billy Joel, John Mellencamp, Queen, Supertramp, Meat Loaf, The Eagles, Zeppelin, AC/DC, Fleetwood Mac, Bruce Springsteen, Aeromith, Bon Jovi, Nirvana, Poison... a little bit of everything.
I'm also a fan of reggae, but only the classic stuff. I love Jimmy Buffett (not really reggae, but I love the island sound), Harry Belafonte, Jimmy Cliff, and Sam Cook. 311 is also awesome when it comes to the rock/reggae fusion.