I didn't look but you might want to try one of the more updated ones from here.
HowTo | BackTrack Linux - Penetration Testing Distribution
There is a guide and a video on the subject. Also if you just want an encrypted container for whatever with out having the actual OS encrypted I did a guide on the subject in the tutorial section here.
EDIT: there are several pages to the link you left. Please make reference to which post or posts you mean.
That way we don't necessarily have to read the whole thing.