it depends on the topic of the site. sites on finance typcially do well. also hot terms used by trial attorneys like 'mesothelioma' also do ridiculously well. my finance-related site used to pay $0.75-$0.95 per click. However, this month I've seen insane volatility. Every other day I get $0.15-$0.20 only! dunno what Google is doing, but if it continues, I'll switch to some other ad network.