Obviously, I do not think the main goal of Netscape is to get more users, but rather to have more participation. However, I would consider this information an indicator of waning interest. It is fairly difficult to compare this to Digg at the moment since there has not been any public statement of their userbase in a while. My guess is that it is fast approaching the magical 1 Million mark. Anyways, take this information for what its worth.
Edit: Muhammad gives some good positive analysis on the topic here.
Any other stats people are interested in seeing?