Buy and sell as many as you want but just follow the google rules So whether or not you philosophically agree with Google's point, if being in Google's search rankings is more important to you than winning an argument, Cutts suggests labeling paid links in the following ways: · Redirect through URL blocked by robots.txt · Redirect through URL using a 302 · Use Javascript to direct the link · Apply the rel= "nofollow†attribute to the link · Add <meta name = "robots" content = "nofollow"/> to the page header It may not be fair to say that Google favors buying links from certain places, but there are "certain places" on the approved list, and they include: · AdBrite · Quigo · IndustryBrains · Microsoft AdCenter · Yahoo! Publisher Network · Any site that doesn't pass PageRank --THIS ONE IS THE IMPORTANT ONE NOW PEOPLE THAT SWAP LINKS THAT IS FINE AS THE SITE THAT LINKS BACK TO YOU USE THESE RULES AS WELL