Cutts noted that those selling links should "... mark them with a nofollow tag. Not doing so can affect your reputation in Google." He also confirmed that a datacenter located at
http://64.233.185.104 is a testing ground for Google.
The most interesting thing found in his blog post touches on link-reputation and spidering depth. The better a site's link-reputation in Google's eyes, the deeper its spiders will travel. "In general, getting good quality links would probably help us know to crawl your site more deeply."