I just thought I'd give something back to the community. This is not a free method, and it requires a bit of effort. When you are an AdWords Qualified Individual (get the Google certificate), every 12 weeks you get 20 vouchers of $100 (or local currency). You can view the requirements to participate in the program right https://adwords.google.com/support/select/professionals/bin/answer.py?answer=12241. Basically you study AdWords, pass the exams, which costs $50 to take and you get your vouchers mailed to you 4 times a year. You can take the exam right http://google.starttest.com/. You'll have to study a bit, or open up AdWords on a different computer when you're taking the test. It's not that easy, but well worth it. You can study everything about AdWords that you need for the test right http://adwords.google.com/support/aw/bin/static.py?hl=en&page=examstudy.cs&ctx=go. And a bit more info about the vouchers when you've passed the https://adwords.google.com/support/select/professionals/bin/answer.py?answer=17377&hl=en. Most of you won't even bother, because you actually have to study a bit and invest a bit of money (wow $50 to get $8.000 back in vouchers), but some of you might find it useful.