I publish articles and bookmarks on several sites which share adsense. One site has halved the page impressions in the last few days, the ctr has halved too and the click value is now virtually nothing. What explains these stats?
Sounds like you have simpley dropped off a bit in search engines, google has just made bit of a jiggle and I am also seeing lots of changes in results in the last few days, dont worry just keep working on improving your sites content and structure aswell as inboud links of course and I am sure things will turn around for you. Dont panic it happens just try and find ways of improving all the time.
I can't stand the thought of starting all over again - I'm starting to think that Google adsense is just a con on article publishing sites and wished I'd put more of my effort into my own sites