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Someone on another board was reporting 404s for google images a while back. If G is busted or not performing properly, who will be surprised. Not me. They're way overdue for a major meltdown, though some may say that the Bourbon update is actually one in progress.
My 6 (count 'em 6) clicks today - a number so low that I know without looking that it hasn't been lower since I added adsense to over 300 pages, at least 6 months ago - have an average earning per click (EPC, a metric that AdSense does not provide in the stats, oddly enough) of nearly .28 cents today, roughly FIVE TIMES HIGHER than my normal EPC.
Something is rotten in Denmark... or Mountainview.
Compared to the last couple of months, traffic looks normal, clickthrough rates look normal, EPC looks normal (up a little over the past few days in fact).
All 100% normal and it has been all day. June 2005 looks like it will be best month I have had since I started with Adsense about 18 months ago.