Take a look at an interesting article explain the Challenges and Opportunity in Local Advertising.

Local online advertising is forecast to grow nearly 48% to $12.6 billion in 2008, according to Borrell Associates. Despite this high growth, the fragmentation and granularity of local advertising creates challenges for national advertisers, resellers and agencies. However, when you have these strategies in your arsenal, you’ll know where to optimize—and how to evaluate solutions that your partners present to you. That’s a strong foundation for seeing real results.

Article HERE:
http://searchengineland.com/challenges-and-opportunity-in-local-advertising-14935.php