I also have it written down because I figure if someone has access to my personal computer physically, and they want my passwords they can probably install some keylogger or something else I don't understand, and this way I'll never forget my password. I also have a list of services that I am signed up for so I don't forget to change my reddit password because I haven't used reddit in the last three weeks after something like heartbleed happens. What I will not do is store my passwords in my browser, that seems like an awful idea. Especially because some things automatically sync across browsers.