Right now - Once Bitten, Twice Shy by Great White.
I listen to quite a bit of what's been posted on here by everyone else, I have a very wide range of favorites and a lot depends on my mood. If I'm angry or irritated it tends to be hard rock/metal (mostly 80's like Metallica, but some newer like Puddle of Mudd & Linkin Park). If I'm in a romantic/appreciating my hubby kind of mood I listen to love songs ranging from Journey to Shania Twain to Guns N Roses to Kenny Rogers. If I'm in a spiritual mood I listen to Christian Rock...mostly Audio Adrenaline & Casting Crowns.
Now my playlist has gone through two more songs - Guns N Roses - Think About You and Meatload - Paradise by the Dashboard Lights is up now.