[nthj]

You could easily increase security by adding another rule that only you know to the seed.

For example, if I am generating a password for [e-mail], I could have a rule that I always append the first four letters of the domain name to my seed.

In this case, I would actually generate a password for [e-mail]+exam.

In this scenario, my master password may be compromised, but the hacker would still have a lot of difficulty using the master passphrase to access any of my accounts.

This, of course, only works if no one else knows your rule, and you could get far more clever with the seeding rule than I was just now before my first cup of coffee.