In the past, I created several web 2.0 or bought them of the marketplace to boost my rankings. After I placed the links and made sure they are indexed, I usually never visit them again. Lately, I was wondering, if I should actively manage them. For example I could update them with new content on a regular basis and "reuse" them by adding more articles that point to my money site and so on. What's your take on this? Is this a waste of time or something that's well worth the effort?