This is the "show" post to HN:
http://news.ycombinator.com/item?id=2442498
I dug this up as im curious to know:
What it was costing to use the site before?
What the plan is to support the site, now that it is free (the experiment)?
From that link, there is some great feedback. http://news.ycombinator.com/item?id=2442724