Google Adwords Vouchers
If you are involved in Pay per click marketing, you are always on a lookout for Google Adwords vouchers (Assuming the account history does not matter to you and you are ok with creating new accounts everytime for some free advertising. 
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Actually Google has clearly specified on their site that you should limit only one voucher per account and you may even get banned for creating multiple accounts to get free advertising.
Anyway if you are newbie totally starting out with pay per click and want to try out Google adwords, you can find some of the links below where you can request Adwords voucher from Google. You need to use your domain email to sign up and request for vouchers.
£30 Advertising Coupon
Google Singapore
Google Japan
50 Euro
The link below will take you to the Adwords signup page and once you have completed the signup, you should see $50 credited to your account.
Thanks for the link to a free coupon. I found another site where I signed up for a hosting trial for $0.01 for the first month and got $25 in Google Adwords free. Check out my blog if you need help with which keywords to use.
Seb Brantigan’s last blog post..PPC Web Spy – free keyword research tool