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It's worth taking the time to set up an alternate ad page to be shown instead of PSAs. You could use the alternate page to feature other areas of your site, link to friends' sites, or perhaps display a few relevant affiliate banners. Remember to open the links on the alternate page in a "new" or "top" window, otherwise if someone clicks one of the links it will just open within the iframe.
Yeah...I saw something seriously wrong with AdSense when I woke up this morning. CTR was down to about 1/3 of normal and CPM was down to about 1/2 of normal. I looked at my adsense tracking program and, sure enough...NO clicks in a time span when I should have had no less than 50. It seems to be okay now, but I probably lost almost $100 in revenue this morning because of it...My sites use the script that collapses the iframe when no ads are found, so no PSAs, but no revenue during that time either.
Urr... collapses the iframe... Can you sticky me and let me know the code on how to do this?