5 Simple Ways to Improve your AdWords Performance...

A little dated but still useful!

1. Enable Ad Sitelinks
2. Optimize your ad text for longer headlines
3. Link a Google Places account to a campaign to show location extensions
4. Get reviewed to show Seller Rating Extensions
5. Link a Merchant Center account to a campaign to show product extensions

   http://adwords.blogspot.com/2011/04/5-simple-ways-to-improve-your-adwords.html