I only joined AdSense a couple of weeks ago with a sports-related site (first post here, g'day!). The value of my clicks today jumped 1000% - yes, ten times as much. I'm guessing that the general category I'm in isn't so lucrative from a keyword point of view, but because I just recently created a subsection dealing specifically with sports injuries, my theory is that that must be why the numbers spiked. I'm eagerly waiting for the channel data to catch up to see if my guess is right. Other possible reasons include: (a) that my clicks today were four times higher than normal, or (b) I just added Adlinks to a few selected pages.