Kimmo Rousku has some interesting observations and a walk through on getting Administrator and/or System level rights on Vista through the use of a recovery CD. One area that he mentions is that you can crack EFS encrypted files with this as well.
I have not toyed with or analyzed Vista yet (except to try and help a coworker configure a static IP, which was rather unpleasant), but gaining Admin/System rights might be useful for acquisition if used in conjunction with Bart PE and a write blocker. I'll defer to those that have done more work here to decide.
I'd guess that if you followed the steps for cracking PGP that I outlined previously, you could use this to crack the EFS files without cracking the SAM. I have no idea if this would be faster than cracking the SAM and using traditional forensic tools would be, but it's always nice to have more than one tool in your toolbox.