As you know, Sphinn, a social news site for lovers of search engines and Internet marketers, was launched last month. My personal blog has been featured on the main page twice and I've only gotten a combined 165 unique visitors from Sphinn.com as the referral.
Apparently, I'm not alone. Matt Webb, aka SEO Honolulu, at Cre8asite Forums, noticed in his analytics that he had a surge of traffic, but the traffic was actually from StumbleUpon, and not Sphinn. I actually recall stumbling upon that site that day. Thus, I'm not surprised.
I've been asked already if it's worth it to submit content to Sphinn and if there will be a good traffic flow to blogs or articles that are submitted. Given my experience and Matt's, I think that we're just watching a baby grow up. As Chris Winfield says, it's still brand new (less than a month old!), but the early adopters can shape it and word of mouth will drive additional traffic to it.
Sphinn is certainly in its infancy and the traffic is not going to blow you away by any means. I think one of the main benefits to it (especially for newer people to the industry or bloggers) is exposure. I came across your blog directly from Sphinn after seeing a few different interesting posts on Sphinn by you. Its also always good to be part of a community from the beginning (if you believe in it and think it will be successful) as you can help shape it.
I personally vouch for Sphinn, not because I help moderate the forum there, but because there is finally a site for people who have a true interest in SEO, SEM, social media, and search to find a community of like-minded individuals where you can actually feel at home. Matt McGee agrees. If you haven't visited yet, I encourage you to do so.
Forum discussion continues at Cre8asite Forums.