Credit Karma: Free Daily TransUnion Credit Score

Offer Link
Use Invitation Code CKFRND
Credit Karma offers free TransUnion daily credit score using Invitation Code CKFRND
Credit card information is NOT required and you don't need to sign up for any trial offers. However, you'll receive targeted advertising from them.

To get around the targeted advertising emails from them open a 10 minute email: http://10minutemail.com/10MinuteMail/index.html

This will give you an email address for ten minutes (you can extend it)
Just click Get my 10 Minute Mail e-mail address.
Use the email address they gave you
Verify any emails that come to you (if needed)
Avoid a mailbox full of spam!