Sites Like El Reg
Sites such as El Reg make this worse by using an authenticated email as the login. If I could login using my made up lusername the leaked data would be of much lower value. Yes, I'm lazy for using autocomplete but you are also lazy for using the email addy for login purposes.
I pretty much always use fake info when possible, a zip code that only matches the first 3 digits if I'm after weather for example, phone numbers with the correct area code but nothing else.