This list is to be taken as is. A small list of some of the largest and fastest growing Ad Networks online today:

1. Admob - Mobile Advertising | Buy Ads | Monetize Traffic | AdMob
2. Admoda - Admoda - Mobile Advertising
3. AdultModa - Adultmoda - Adult Mobile Advertising
4. BuzzCity - BuzzCity - Connecting the Unwired
5. InMobi - InMobi | Global Mobile Ad Network
6. Jumptap - http://www.jumptap.com/
7. Madhouse - Madhouse Inc.
8. Millenial Media - Mobile Advertising with Millennial Media
9. Quattro Wireless - iPhone Advertising | Mobile Advertising | Grow Revenue | Reach Consumers | Quattro Wireless
10. Hands - Hands - Awesome Mobile
11. Microsoft Mobile - MSN Mobile Advertising Connects You to Affluent Consumers
12. Pudding Media - Home
13. YOC group - YOC AG - EUROPE’S LEADING FULL-SERVICE MOBILE MARKETING PROVIDER

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This looks great. So what offers are optimized for cell phones? I mean you could send them to any offer but if the landing page isn't sized right then I can imagine it won't convert that well.