Jim Boykin gives an over view of link buying and link building strategy. He says that:
Keep in mind that we don’t go for homepage links (99% only powerful subpages), and we work on getting links within the content area of webpages (something that looks like this), and sometimes we add co-citation (something I don’t want to talk about today). And yes, if we can get our ads above the fold, with a nice banner to boot, that’s even better (but not always possible).
He also gives some snapshots of earlier link value tools and many valuable links which are eminetly useful.