At work:

The Who's Tommy
The Best of Rent
Pippin Original Cast Soundtrack
(I tend to listen to showtunes at work for whatever reason)
BNL - Rock Spectacle
Paul Westerberg - Eventually

In my car (these are the ones I remember...I keep a bunch in there):

BNL - Everything to Everyone, Born on a Pirate Ship
John Mayer - Room for Squares
Incubus - Morning View, a mix CD that my boyfriend made of their other albums
Billy Joel - Greatest Hits Vol. III
Jewel - Pieces of You
Bon Jovi - Cross Roads
Beatles - Number 1's
Sublime - Sublime
Madonna - Immaculate Collection
Alanis Morrisette - Jagged Little Pill
Romeo + Juliet soundtrack
A random old-school R&B/hip hop mix CD
Meat Loaf - Bat out of Hell
Green Day - Dookie

I think there are a few others in there, too, but I don't remember what they are.