[Simon]

One thing I add to my Excel spreadsheet is a column for the email I used when I signed up. That can help if you need to have your password reset and sent to you. Plus I almost always signup using an email address like "sponsor-name@mytrackingdomain.com" so I can filter their incoming emails directly into a folder and, maybe more important, I can be pretty sure when someone has sold/rented/traded my email address.