I use passwordmaker myself, for online/computer passwords, I use both the firefox plugin and the standalone javascript version and praying to the almighty devs, whoever who or whom that might be, for a N900 app.

I use this since no password is ever the same, impossible to get my "real" password, so now I have 16+ passwords everywhere on the internets. AND I just have to remember two really strong passwords.

One password for generating passwords (the so called master password)
Together with the "url to the site + username" or "myuser@thehost" for logins.

The second password is something I have for more physical non-changeable passwords. Right now im using pysafe.