Lastpass allows for multifactor authentication and restriction by ip which means that even if your master password is compromised the overall security is maintained.
I haven't experienced any of the problems other reviewers with it logging it you out however I simply used the plugins for all the browsers and you can specify the length of time you would like to remain logged in for.
It's so good. I implemented at the company I work for.
(I have a paid account for mobile access).
