the nice thing about being jailbroken, is you can mess around with your host file. very easy way to block ads in apps. hmm. this link
used to work, don't know if it's down for good or not. but it was a nice host file full of advertisers that were redirected to 127.0.0.1 to stop your phone from grabbing ads from the net.
if anyone wants a copy of the file i can look into posting it up.