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When I switched to leaderboard I doubled to tripled traffic as well.
But what do you know I just checked my stats and yesterday's stats showed a huge bump from when I last checked it after 3am. It broke to a record CTR, and todays is double that!
But the amount of ads shown is very low so I think their stats are screwed up today. I think the clickthroughs are showing correctly but their impressions count is very low..
Check out this thread for more on this phenomenon:
My clicks and earnings last Sunday (the first Sunday with the Leaderboards) were way more than double what they were the previous Sunday with banners. Didn't hear a peep from Google. :)
Your users are seeing something new so they are clicking on it out of curiousty. Enjoy the higher earnings while they last, but I suspect they will come down over the next two weeks.
You have nothing to worry about though. Just calm down. :)
still almost double last week's figures but I think that was because of the change to the leaderboard format. And I'm very pleased about Sunday's earnings
I went to adsense and got the leaderboard code and have added that to half of the zones in my phpadsnew set up, but it keeps calling the 468 and putting it into a leaderboard white space.