Just a warning - GoDaddy will automatically charge your credit card to renew current domains. You have to remove your payment information or delete the domains.
This isn't entirely accurate. GoDaddy has both auto-renewal and manual renewal. I'm not sure what the default is these days, but you can set your domains to manual renewal and let them expire. Be warned: you're going to get a ton of email notifications from GoDaddy as your expiration dates approach.
Thanks for that, didn't even realize you could delete domains before they expired. Just deleted 30 domains from godaddy that i had no intention of renewing.