I see there was already a meta question regarding this but it was back during the private beta. The site is now in the public beta and still not very healthy with only 2.1 questions per day and a very low 219 visits per day compared to the recommended 1,500...
I'm not sure what happens once the beta ends but only 14 days remain and from what I've seen the numbers have not improved much at all since I've been a member here. I've thought about going to other areas and "advertising" the site but most places where one could attract members (reprap.org, various subreddits, groups on Facebook) are areas I feel we may be in competition with and it would not put the site in good standing if we were to do so.
I don't really know what the value here is over other forums other than the site being owned by a neutral party. The forums at reprap.org would probably be the closest thing to this site seeing as how they have no real ties to any one printer/design/company and moderation is quite lax as in you can post nearly anything 3D printing related and not encounter any trouble. The problem I believe is the site is trying to compete with other forums, one of which has been "the" forum pretty much since printing began and the main domain holds the majority of the information about home 3D printing.
I guess being new here I don't really understand the value in the site over the others or if there really is any other than being just another bank of information.
Currently, there hasn't been a new question in 2 days...