I don't know if this is allowed, but whoever is in the coop using this site is framing other peoples sites through the coop links: http://4hotelrates.com If you scroll to the bottom you can see the coop links... click on one of them. It seems that this could/would cause duplicate content issues. ***If this is not an issue than sorry I brought it up.
I don't know about the framing, but those ads are almost hidden, very few people will click on them when they are in a small font at the bottom of the page. Isn't it against the TOS?