Those 3 versions of GMail could have been one version that was most useful. There was no time constraint for it since it was a side-project.
The links to nowhere sounds like a good idea except I don't think it indicates interest in the feature being built. A link's text is usually very short and you don't really get any demographics from a click. If you knew 15 to 20 yr olds were clicking a link but the rest of the site was mainly used by 30 to 40 yr olds, you might want to spin out the link as a separate site instead of just a new feature or something. But how do you know how interested people really are? :/