Here are some useful links:
1. Calculate Impressions & CPM

2. How to Track Ad Results

3.
TAB: The Traffic Audit Bureau

4.
Advertising during a recession.

5. OAAA-Outdoor Association

6. 5 Brand-Busting Mistakes to Avoid

7. Hold the Line on Price

8. 7 Steps to the Perfect Marketing Plan

9. 4 Metrics For Measuring Success

10. 5 Cardinal Rules of Logo Design

11. Implement a PR Strategy in 7 Days

12. Free SEO Tools

13. Creative Resources Center-Advertising Library

14. Extended Warranty

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