Is there a problem with having adsence and other ad service ads on the same page? This is the page I cam referring to. http://www.norcalcars.com/articles/AffordableSportsCars.aspx
you can use other ads with adsense but they must not be similar like each showing tex or image ads. I use three type of ads on one of my sites adsense, adbrite, and widget buck. The adsense ads are tes ads only the other ads from adbrite are done manualy to show banner ads and widget bucks are also banner ads. sp they show differently.
yes it's fine as long as the ads are not from casino, porn, and other topics not allowed by adsense. Also if the other ads are looking like other adsense blocks, they need to have at least different colors, not to look exactly like adsense's blocks.