The Ghost and the Goth by Stacey Kade
I picked this up on the advice of Stories and Sweeties: she gave it 4 and a half out of 5 cupcakes.
I'd agree with that. It's your basic "teen queen gets hit by a bus and starts haunting the only dude at school who can hear her and antics ensue" tale. I ate it up. I expected it to be vapid and the writing to suck, but neither of those were true and I happily passed it along to some teenage girls I know - they'll relate to the fact that what you see from the outside is never the full story of someone's life. A lesson even adults could use reminding of now and then.
It's ultimately going to be a trilogy and the second is out already. Part of me wishes I'd waited until book 3 is out so I can read them all in succession, but this way will work, too.