LastPass Password Manager
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Full user review
"I should have installed this sooner..."
Runs on multiple browsers, has a mobile version for android and iphone, you can bundle with Xmarks and get a package deal for advanced functionality. Easy to create, use and manage passwords of ridiculous complexity. If you decide to switch between mutiple browsers, no problem. Has multiple options for two factor authentication which are free (i.e. Google Authenticator), supports Yubikey. Great documentation that is simple to read and understand. Unobtrusiive interface... you don't know it is there unless you need it.
None that I have encountered. This product is fantastic. As I said in the summary, I should have installed this sooner. I've read some comments about security breaches - do a quick google search, you'll find this was a non-event and instead proved Lastpass knows their business and how to respond to protect your data. Also, your data is encrypted - Lastpass can't decipher it, so they warn you - you better not forget your master password.
Excellent package. Do yourself a favor and install it... also, give Xmarks a try... you'll be glad you did. Oh, and if you can afford it, pay the $20 / year for the enhanced version. It is well worth it.