Free Google Credits
Earn free Google adwords credits. Web hosting companies provide this as a bonus for signing up with them. The list and link to claim these offers are given below.
$50 free Google credit when you signup (plus free Domain Forever and Unlimited Email Accounts). Claim this Hostmonster offer.
$50 Free Google Credit (plus $25 Yahoo Credit) from Fatcoe. Claim this Fatcow offer
$25 Google Credit (plus $25 Yahoo Credit $50 MIVA Credit) from Webhostingpad. Claim this Webhostingpad offer