Checkpoint full disk encryption
Checkpoint Disk Encryption, formerly known as Pointsec, aka End Point Encryption is a package for encrypting Windows PC disks. See the Checkpoint site for all current information.
Items of interest to Forensics people
It comes in two flavors, boot password protect and Windows Pass-through. Boot protect means you're going to need the key. Windows pass-through means you can attack the OS to get to the underlying data (on a working copy, of course). Once you have an OS key, you can use a fresh copy to assemble evidence.
Checkpoint(sec) does supply boot drivers that allow you to mount a pass-through volume inside a BartPE environment. Very useful. Drivers are available from Checkpoint.