I ran across this info today, and thought that I'd post it...it seems quite important, in that it pertains to the use of physical memory (RAM) to deal with whole disk encryption (WDE), referred to as "cold boot attacks on disk encryption".

This looks like very cool stuff. Give it a read, and let me know what you think.

Don't forget that TechPathways provides a tool called ZeroView, which can reportedly be used to detect WDE.