I need to secure systems against _physical_ intrusion (i.e. someone walking-in and stealing the server). In essence, I need to do remote system integrity attestation.
Right now, I'm using a modified version of GRUB (trusted GRUB) to establish validity of the kernel (and I was flamed to a crisp when I offered to help to port it to GRUB2 on the GRUB mailing list :) ). TXT support in the kernel would help much.