Wlauzon - 3:15 pm on May 28, 2012 (gmt 0)
Many government sites have issues beyond just not resolving without the www. I find more broken links, 500 errors, various server errors, etc. etc. on federal government sites than almost any non-government site. Oddly, I almost never find such errors on state.gov sites.
Just as an aside, nrel.gov does resolve - it used to be one of the worst for broken links etc, but they finally fixed it a few months ago.