Top 15 ad networks, March 2008

	Audience, 000	% Reach
Total Internet	188,010
Platform-A	170,537	90.7
Yahoo! Network	160,336	85.3
Google Ad Network	152,048	80.9
Specific Media	145,554	77.4
ValueClick Networks	140,091	74.5
Tribal Fusion	135,640	72.1
Casale Media Network	129,399	68.8
DRIVEpm	124,333	66.1
adconion media group	117,469	62.5
interCLICK	108,818	57.9
Traffic Marketplace	105,420	56.1
Collective Media	100,151	53.3
24/7 Real Media	94,525	50.3
ADSDAQ by ContextWeb	94,459	50.2
Burst Media	93,291	49.6
Source: comScore