[paulgb]

That seems like what SuperGenPass (http://supergenpass.com/) does, but with more effort and easier to break. Essentially, with SGP you type a master password into the password box and click the button in your browser (you don't have to install anything, just bookmark the javascript). It uses a one-way hash to create a unique password based on the domain.

[joeguilmette]

I guess, but my method only uses my brain. I can access my accounts using an internet cafe, someone else's iPod Touch, etc.