briggidere - 8:04 am on Aug 30, 2006 (gmt 0)

Traffic Volume
1) Google AdWords
2) Yahoo Search Marketing
3) MSN adCenter

Quality of Click (Based on conversion data)
1) MSN adCenter
2) Google AdWords
3) Yahoo Search Marketing

Ease of Use
1) Google
2) MSN
3) Yahoo

Lowest Cost per Conversion (Lowest is better)
1) MSN
2) Google
3) Yahoo

Technical Support
1) Yahoo
2) MSN
3) Google

Has the Options for Your Needs
1) Google
2) MSN
3) Yahoo

versatile
1) Google
2) MSN
3) Yahoo

Overall
1) Google
2) MSN
3) Yahoo