Another important way to erase fingerprints is to have different email accounts.

If you have multiple ISPs, that's a good start...But here's some more tips:

Of course, you can have tons of GMail accounts.

Better yet, www.mail.com offers you 250+ different email domains, including many cities, US states and countries.

Managing multiple email addresses...Here's two FREE multi email checkers:

http://www.eprompter.com/ FREE ePrompter will check up to 16 email addresses.

http://www.poppeeper.com/ FREE

I use:
http://enterprise.pennock.nl/pen/

It checks unlimited email accounts (check link above for list of email services) and it's only $5.

All of these programs are great and allow you to keep track of a bunch of email addresses all in "one place".

Here is another mass email checker that I use (its free):