Most of my most played is like...Marilyn Manson, due ot my short burst of obsession with him. I have no shame (but a little guilt).
However, if my library didn't routinely crash every year or so, Pink Floyd, Beatles, and Bob Dylan would be dominating the top played.
(I don't have last.fm, no)
So in that spirit, I'll just rattle off a few things:
Things I used to listen to way too much:
Beatles
Queen
Led Zeppelin
Heart
Moody Blues
Pink Floyd
Jethro Tull
Melanie
Nickelback (I have no shame, only guilt)
Paul Simon
Emerson, Lake and Palmer
The Who
Things I have recently (past year or so) ended up listening to far too much of:
Ministry
Pearl Jam
White/Rob Zombie
Apocalyptica
The Flaming Lips
Metallica
Black Sabbath
Marilyn Manson
Traffic
The Books
Rush
Guns 'n' Roses
Recently been listening to a lot of:
Franz Ferdinand
Muse
Billy Joe Shaver
Iron & Wine
Daft Punk
You Say Party! We Say Die!
Cat Stevens
Mogwai
Explosions in the Sky
Grizzly Bear
So, er, try to judge me.
You can sort of see the phases I went through. It's amusing...to me, anyways.
Edit: Also put Bob Dylan into all of those categories, and Tom Waits onto the last one.