What are some alternatives?
BuySellAds - BuySellAds.com Online Advertising Network
MyBuys - MyBuys provides coordinated, cross-channel personalization services for Display Ads, Email and Websites
Sonobi - Sonobi is an advertising technology that offers a solution for publishers, media agencies and advertiser brands to drive results.
Swoop - Swoop is a closed loop marketplace, providing a direct relationship between advertiser and publisher.
Newsmax Feed Network - Newsmax Feed Network is a fast, easy and inexpensive way to reach new customers through targeted content streams.
CPMStar - CPMStar is an Ad Network providing advertising solutions to the gaming industry.