Have you guys tested different link colors other than the generic blue that almost everyone is using for their AdSense? The red seems to convert about 2% higher than blue after 2 months of testing.
Possibly, depending on the particular site. I don't use red or blue.... I try to blend adsense links with the same or similar color as site content and links (link, hover, active)
Red can be a more attention catching color I guess, as many links are blue. I'm with cujo though. I also try to blend adsense links with the same or similar colors as my sites.