How NoFollow Works, and How to Control the GoogleBot
NoFollow is standard in websites now, and so is robots.txt. This article by Google tells you exactly how these work, and exactly how they DON’T work.
Basically, rel=nofollow in a link means that the bot won’t follow that link, but if the target page is linked from another place, Google can still find it and index it. Robots.txt is a better way, but more for domain-wide stuff. Finally, it explains how to use meta tags to not index, and not cache pages. Some useful info - thanks Google!
