Reading Zeth's blog, I've found this interesting article about encrypting your /home.. And the reasons had convinced me to do the same.
One observation (I see this happen in more than one thinkpad model) :
I don't know why, but Ubuntu linux eat lots of minutes to boot with a black screen, and when you use a encrypted /home, you'll need to imaginate when type the password..
A: Just remove "splash silent" from the line kernel of your grub.
UPDATE: Just edit /etc/usplash.conf