I just signed up for ADSDAQ, a CPM advertising site (much like google’s adsense, but CPM). Signed up and had their ads up within 3 minutes. Very fast and easy registration and as simple as pasting a little script of code into your pages just like adsense, YPN, or other scripts. One of the unique concepts is ADSDAQ lets you decide what your CPM prices will be, and then you keep track of your Fill Rate and then adjust the pricing accordingly.
I’ll update with some stats and fill rates for different prices later.