The recent implementation of custom search techniques in Google searches make it an even stronger possibility. Obviously they value the user’s choice of listings when considering where to rank a site.

With this being said, don’t think getting spammy would work, even if this was true. First off, the algorithm would only take into account clicks from different IP addresses. So, don’t think you can keep clicking on results to your site from the same computer to boost rankings. In fact, if Google detects that you’re doing this, your site could theoretically be penalized without you even knowing it.

I don’t know the answer to this question, but it makes sense that it would play some role into how relevant a listing is for a particular search term. Some food for thought to get you through the week.