Who has the best full disk encryption solution?

Last week, a ZDNet blog post mentioned that US federal government is conducting a contest to find the best full disk encryption product. The winner will become the preferred federal solution to address data loss issues from stolen or missing computers.

The who's who of storage and encryption industry like Seagate, CipherOptics, Credant, Decru, NetApp, McAfee and PointSec attended the industry briefing. Click here for RFP information on Data at Rest (DAR) Encryption program.

The RFP DAR Technical Requirements provides high level criteria for a DAR solution.

• FIPS compliant algorithms for encryption, hashing and signing
  
• Encrypt data on removable storage media/devices
  
• Single management console for Full Disk and File Encryption
  
• File compression and encryption in a single step
  
• Boot authentication

I wonder what are the different techniques for DAR encryption?