I’m working on a mobile version for my sites as well, more and more people are using their mobiles to access the net.
recently I found out about a network for mobile sites adiquity.com
you might want to try it and let us know how it goes
it does not hurt to try other networks on a limited basis to see if he can make extra money, I always do.
personally I never tried adiquity, actually I found out it’s for mobile sites after I applied and they turned me down because my site is not designed for mobiles