Top US ad carriers in September 2008

1	Platform-A	171,692	91%
2	Yahoo! Network	161,996	86%
3	Google Ad Network	156,355	83%
4	Specific Media	153,435	81%
5	ValueClick Networks	150,395	79%
6	Tribal Fusion	141,850	75%
7	Yahoo!	140,200	74%
8	Google	136,219	72%
9	Traffic Marketplace	131,458	69%
10	YuMe Video Network	130,238	69%
11	24/7 Real Media	128,775	68%
12	Casale Media – MediaNet	128,585	68%
13	Tremor Media – Potential Reach	128,060	68%
14	Adconion Media Group	122,632	65%
15	interCLICK	121,987	64%
16	Revenue Science	120,899	64%
17	DRIVEpm	113,162	60%
18	CPX Interactive	111,847	59%
19	ADSDAQ by ContextWeb	109,570	58%
20	Collective Media	109,489	58%
21	MSN-Windows Live	109,274	58%
22	AOL Media Network	108,349	57%
23	Burst Media	101,493	54%
24	Turn, Inc	101,462	54%
25	Undertone Networks	85,722	45%
26	Centro – Potential Reach	83,921	44%
27	AdBrite	79,853	42%
28	YOUTUBE.COM	75,389	40%
29	NNN Total Newspapers: U.S.	73,880	39%
30	Vibrant Media	73,323	39%
31	MYSPACE.COM	73,035	39%
32	Gorilla Nation Media	64,303	34%
33	Ask Network	62,101	33%
34	Kontera	58,809	31%
35	Pulse 360	58,559	31%
36	MSN.COM Home Page	57,457	30%
37	EBAY.COM	55,476	29%
38	ITN National Broadband Networks	54,905	29%
39	Ybrant – Oridian – ADdynamix Network	53,993	28%
40	IB Local Network	53,645	28%
41	IAC Ad Solutions – Potential Reach	52,405	28%
42	NNN Top 25	51,222	27%
43	Intergi – Potential Reach	48,929	26%
44	Business.com Network	47,174	25%
45	QuadrantONE – Potential Reach	46,403	24%
46	AMAZON.COM	45,980	24%
47	TattoMedia	44,894	24%
48	MapQuest	44,588	24%
49	AdOn Network	43,719	23%
50	NNN Top 10	42,032	22%
Source: comScore