Just ones I can think of right now:
Miranda Cosgrove (ICarly Soundtrack)
Demi Lovato (Here We Go Again)
Taylor Hicks (The Distance on CD it's self)
Taylor Hicks (Under the Radar)
The Waybacks (Burger After Church)
Go Fish (Snow, Superstar, Splash, Part of the Proof, Created for This, Snow, ect.)
Green Day (Insomniac on CD)
Sid Hartman (interview cd)
Jeff Allen
Randy Owen (One on One)
Brandon Rogers

JLS - Outta This World

I got "My Heart Will Go On" single signed by Céline Dion

Sophie Ellis Bextor - Bittersweet
Shayne Ward - Obsession (Play.com)
Olly Murs - Olly Murs (HMV)

And waiting on RuPaul - Supermodel of the World, which I posted the other day.

Britney Spears ("In The Zone", "Greatest Hits: My Prerogative" and "Circus")
Taylor Swift - "Fearless"
Selena Gomez - "A Year Without Rain"
Corbin Bleu - "Another Side"

Add 2 my list...... Justin Bieber's My World 2.0

I dont like cd sleeves for autographs (their too little) and honestly dont own many cds anymore (most everything is digital and I put most of my cds on Ebay). I also just download the one or two songs I like most of the time and spend a couple bucks instead of $15 for the entire cd.

I do collect signed records and have some from Buddy Guy, Rob Zombie, Joan Jett, Moby, Dirty Vegas, the Misfits and a few others. Just about everything new can be found on Vinyl which comes with a download card to get the record on your mp3 player.

i have taylor swift - fearless but selena gomez - ayear without rain deluxe edition is due to come any day as i bought it

added to my list:
The Wanted

I have

Daughtry's "Leave This Town" (signed by Chris)
Saving Abel's first album