List of Mobile Advertising Networks

admob - http://www.admob.com/
iAds - https://developer.apple.com/iad/
Adfonic - http://www.adfonic.com/
Enpocket - http://advertising.nokia.com/
Greystripe
inMobi - http://www.inmobi.com/
LeadBolt - http://www.leadbolt.com/
Millennial Media - http://www.millennialmedia.com/
MobYD - http://www.mobyd.com/
Trademob - http://www.trademob.com/
Voltari

See Also,
What is Mobile Advertising?