I started using Mitro, recently for the same thing. I had been slowly working on a system which would store pseudo-randomly generated salts and store one for e

I started using Mitro, recently for the same thing. I had been slowly working on a system which would store pseudo-randomly generated salts and store one for each individual domain. It would detect which site I was entering my password into, take the relevant salt and digest it against the password I had entered - sending a stupidly long, digested passwords to the sites which would allow for it. The password itself would never leave my computer. Progress was slow, though, and other projects took priority. With Mitro, I've done a similar thing by pseudo-randomly generating 64-character base64 strings to store as the passwords for my accounts.