So there's kind of two identical versions of the site, there's fastlane.nsf.gov, and there's fastlane-beta.nsf.gov. Earlier both were working fine, now only the latter is still loading for me. I also think http://www.nsfgrfp.org/ changed it's link for "check my application" from the one with beta (which is still up) to the one without beta (which just gives you a blank screen now). So I guess stuff* is happening tonight.
*No guarantee that "stuff" is posting lists, could just be regular maintenance.