With the recent updates to the algorithm having to do with link networks and over optimization it has got me to thinking about the footer links we add to each site that we build and do web design for linking back to ours. I could certainly see how Google could make the assumption that these are all on the same server, pointing back to one main site, and penalize us for that. Should we no=follow these links? They may say something like, "Website Designed By: Company Name". They do provide a valuable source to some extent of traffic to the site from people interested in our designs. Any thoughts?