It has also released its IRS 990 tax statement for tax year 2007 (as a nonprofit, NSN's tax returns are public information. If you knew where to look, you could find this information). It's not that easy to locate though, so, here's a VERY brief summary of NSN's finances over the past years. I collected this information from its publicly available IRS tax returns.
I'm not sure when NSN files, but I'll find out when the 2008 tax return will be available.
(I got the announcement via NSN's e-newsletter to members, at approx. 382 days after the organization's finance chair publicly announced the finances would be available "soon." I haven't stopped the clock yet on the widget below until I know more about if and when the 2008 audit will ever be published).