I just started using this, and I like it a lot but could love it depending on additions.
It would be fantastic if we could choose the characters used in the passwords. Some sites only accept capital letter, lowercase, and digits. Others will accept whatever.
It would also be nice if we could merge website password and usernames. For example, Justin.tv owns Twitch.tv. As a member of Justin.tv, I can log into twitch.tv; but it require the same username and password used for my Justin.tv account (visa versa). Even though my account/username is merged from the two sites, Mojo insists on using a different password for different URLs. Thus, I can't use password mojo for Twitch.tv. I have to log into Justin.tv first then go to twitch.tv.
It would also be cool if we had choices regarding how long or short our passwords can be.