Hi soul-healer, your suggestion of posting to digg.com really works for me! My CTR has doubled from a low 0.5% to a, er.. still low 1.0%. But it's a good start, and it makes my day. Thanks!
Np mate .. Work hard on optimization and makes channel for each Ad unit to track its performance move places of ads till you find the best place. Also Google Groups are good source of traffic but post msg only in realvant Groups to traget specific audience but make sure your message didnt look like spam and help full for group members.
Nonetheless, my digg submission was dug not many times, but resulted in quite a significant rise in my pageviews. I'm happy about it.