There are many DVD versions of this.
Standard one
FYE/Suncoast for the Steel box edition
Play.com 2 disc special edition (September)
Best Buy is offering a bonus disc with 30 minutes of behind the scenes footage:
Australias EzyDVD has a tin:
Target's giving out a CD of Rob's Party Mix with each dvd sale:
1. OK GO * Here It Goes Again
2. Goldfrapp * Ooh La La
3. Coconut Records * West Coast
4. Scissors for Lefty * Got Your Moments
5. The Vapors * Turning Japanese
6. Parliament * Give Up The Funk
7. Of Montreal * Wraith Pinned To The Mist
8. The Blood Arm * Do I Have Your Attention?
9. Bright Eyes * Four Winds
Shop at Kmart/Sears to get a Cloverfield Ringtone.
http://cloverfieldclues.blogspot.com/2008/04/more-cloverfield-dvd-exclusives.html
That's about 7... without the inevitable Blu Ray Special Edition. Which to go for?