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'nofollow'
Google's official word on “nofollow” links is: ”In general, we don't follow them.”, which suggests that they still do. The proportion of 'nofollow' links may also help Google to determine whether a link profile is natural.
<a rel="nofollow" href="siteX.com">link to X<a>According to Google, links from ads should be 'nofollow'ed. However, Google can probably identify and filter them out.
Going too far with PageRank sculpting — by 'nofollow'ing all outbound links — may be a sign of gaming the system.