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I've been in Adsense since 7/1 with 468*60s exclusively. As soon as the leaderboards became available late last night, I switched over about 85% of the pages that I have Adsense on to leaderboards. My clicks have soared today while my site traffic is down about 10% from earlier this week. While I was expecting an increase since we've gone from 2 ads per banner to 4 ads per banner, I never dreamed it would do as well as it has.
Of course, and this really can't be stressed enough, one day does not give a good read on anything. It could just be the newness factor kicking in.
a 'widget maker' page, which lists all info about a particular widget maker. This gets a 468x60
a 'widget article' page, which lists lots of information about widgets. This gets the big rectangular one, in the middle of the text, float:right.
a 'widget maker index' page, which lists all widget makers in A-Z order. This has no ads, since I don't expect any user to want to leave the site at this point.
Seems to be working, anyways...