Really? How about http://www.nytimes.com/2009/07/18/technology/companies/18amazon.html when they did in the past? Is it still unlikely?
I do a variation of this.
I have a google notebook with every site and the username I use on the site. Sometimes it's email address, or name, or one of 4-5 handles. I also list a mnemonic for the password that I used on the site. That page is basically for me, and I update it all the time as I add new sites, change passwords etc...
In a fireproof safe in my closet I have an envelope that contains my current google password and the key to the mnemonics. It gets updated whenever I change the google password or add a bunch of new mnemonics. My wife knows where it is and what it's for.
If all else fails, lower your standards.