Ahsan Sana has developed an interesting way of displaying adsense vertical ads on your website. Adsense Float allows you to place 160×600 outside of your website design by floating it to the left hand side of the page. It was designed for 120×600, 160×600 and 120×240 vertical ad formats.
This is a useful option for those of you who don’t want to place large banner ads within your main design. In the latest versions Ahsan has improved the plugin so that ads do not overlap the content or scroll down the page when you you scroll.
Ahsan claims that click through rates dramatically increase when using Adsense Float though Brad from Stitch Kingdom made a good point when he noted that any increase was probably due to people trying to close the ad.
I personally prefer to keep all ads within the main content area though if you think differently I recommend you check Adsense Float out 
Kevin
Adsense Float: Information & Download
No, and that was another point I had made in the comments for the plug-in (thanks for the mention on the other note tho).
My first complaint, which was mentioned above, was that I first viewed the author's site on a laptop screen with crappy resolution. The end result was that the ad took up the entire left portion of the screen, so I couldn't see content or the X to close the ad. I would have had no choice but to click it if I hadn't known better.
That in itself is easy enough to fix by only showing it on clients with a minimum resolution but the fact is AdSense TOS specifically prohibits from drawing attention to the ads and it seems to be fully agreed on the AdSense group that a floating ad does in fact draw unnecessary attention to the ad, so you would be jeopardizing your AdSense account.
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