DarkBlue

DarkBlue is an online affiliate network serving over one billion impressions per month from a base of over 11,000 affiliates producing more than 1 billion impressions per month. They also report that, "90% of the affiliates, and 95% of the traffic is us-based."

Nicely designed and functional user interface. Smallish collection of offers, but worth a look.

From the website, for publishers:

DarkBlue is a trusted third party between advertisers and affiliates, providing services such as free ad serving, tracking, statistical reporting, real time service and support, and a quick turnaround for advertisers.

Monthly payout with a minimum of at least $30.

DarkBlue Affiliate Signup
or just visit at DarkBlue