In this month (September 2009) day by day my eCPM dropped from $8 to $2, I don't know what happened with google adsense publisher and advertiser programs right now. My visitors and clicks are stable. Usually I get $30 - $50 each day but in this month I only get about $20 per day. How about your google adsense eCPM dropped too?
Research about Smart Pricing I'm Brazilian too and I don't think we should accept a shitty revenue because of that. Maybe the way to go in some sites is getting direct advertisers.
I saw the same last days. It suddenly dropped and later again increated. Maybe it is some issue with google adsense
google cannot find advertisers as people have stopped advertising through google adwords due to recession. Recession will end in last quarter 2010 .Till then we all can sleep and we must not expect more from adsense unless you add more pages or sites.