A few Things you can do with AdWords:

Google AdWords is an advertising medium like no other.

•
There is only a $5 signup fee (which is converted into bid credits).
•
You can have ads across Google’s network of sites in less than 10 minutes.
•
Google’s broad match technology allows you to receive extremely broad
distribution while keeping it quick, easy, and simple to use. Overture now
does this too.
•
Google’s vast distribution network makes it possible to test a business
model without fully investing into creating that business.
•
Google AdWords has syndication which you can turn on or off to
determine whether or not you want AOL users and other searchers to see
your message.
•
Google has a content network of sites (including a few of mine) which you
can decide whether or not you want to advertise on.
•
Google has rolled out Geotargeting so you can target your ad to a country,
state, metro area, zip code, or geographic radius of your choice. You can
run multiple ads for the same words and test them against each other or
send them to different pages to A/B split test your site or ad copy.