I found this site http://www.technorati.com/search/adsense and impress to the way his ads shows. It look like not an ad don't even have underline for the links of ads. I want to try doing the same thing but want to ask first the opinion of others if this is not against the TOS of adsense.
You need to be a premium publisher to change the display in any way, and then only after google approves it. The site needs a minimum of 750,000 page views per month before you can apply.
That's not all they get, I read they are able to negotiate the percentage Google takes, I'd like do be able to do that.