PwdHash

PwdHash - "PwdHash is an browser extension that transparently converts a user's password into a domain-specific password. Automatically generates per-site passwords if you prefix your password with @@ or press F2 beforehand." This way u can easily use one common password but it generates unique password because it hashes the password using the domain name and the password. It is available for the Mozilla/Firefox/Opera/IE . This extension came out of a research from Stanford University. Brilliant idea.