Whitey - 7:47 am on Feb 28, 2010 (gmt 0)
Does Bing's explanation throw any light on how link buying is treated at Google :
Legit vs. illegit
Itís clear that links to and from other trusted sites for the benefit of the customer are legitimate and good.
Unfortunately, some sites try to game the system by playing with how their inbound links are achieved.
It's a good practical read