Interesting. I am interested in this topic, but no only for the file system encryption.

Integrating S/MIME for e-mail and certificate based authentication in browser is much more attractive.

Mail might be feasible, browser is difficult due to the closed source issues, but you can still use the vpn integrated with smart cards, too protect TLS unaware applications.

Is there any irc channel where you usually hang out?

BTW: I was think about doing this for N8x0. N9 was also an option.