With 24/7 Media struggling the way they are, a change like this comes as no surprise, but it is disappointing.
The sad fact is, those CPM-based ad networks that are still accepting small sites (AmazingMedia, Everyone.net, FocusIN and Banner-Mania) all offer similar pay rates, once commissions and unsold inventory is taken into consideration.
That's why cost-cutting and guerilla marketinghave become such valued artforms of late.
My advice to you, Woofcat, is to explore the CPA and CPS affiliate programs (Websponsors.com, CJ, DirectLeads, Sponsorships.net, Amazon.com, etc), searchboxes and perhaps popups. Banner ad networks just aren't making the grade, in most cases.