Do you wish to use a different ad selling program for your space? I came across Kumomo.com and it's free, so I gave it a try.

Kumomo is a marketplace to buy and sell ad space. Upon listing your ad space in Kumomo, advertisers can book your ad space online easily, relevant to their marketing campaign.

Ad space owner has the option to donate certain percentage (from 1% to all) of your ad revenue to charity for every successful booking. There is no catch, you will deal directly with your ad buyer, to collect the remaining payment. Either Paypal or any sort that you and your advertiser agrees.

No obligations, no charges, free to use, it's a new stream of option to sell and manage your ad spaces.

Try it out now at www.Kumomo.com.