I have noticed alot of hosting companies offer free google/yahoo/microsoft advertising vouchers with hosting purchases.

How do they get these?

Is there somewhere on google to apply for them?
I assume this is some offer by the advertisers and the hosts arent paying the $ out of ther own money.

I want to offer them to my customers.

These are normally very big companies, so they may have made a deal with google etc.

Did you find out anything about this? From what i gathered from an email i received from google, i would basically get buy 1 get 1 free for every dollar i spent on adwords. The "free" adwords could then be sued for my clients. Definitely wasnt as good of a deal as i had hoped.