First of all, I love LastPass, and I've tried a few.
(The only trouble I have is the auto-logout features.)
Anyway, I would love to see the following feature in the future:
LastPass analyzes the strength of all new passwords stored and notifies if the password is weak.
When the user sees such notification, the options may be "ignore" or "remind me in x days".
Too determine if a password is weak, see http://www.hackosis.com/projects/bfcalc/bfcalc.php