For a list of the stations already surveyed, see the following link: http://www.surfacestations.org/USHCN_stationlist.htm
And here is the link where I originally found this survey at in the first place: http://wattsupwiththat.wordpress.com/test/
Also, here is the link to the actual home website devoted to this project: http://www.surfacestations.org/
BTW, for an idea of some of the ridiculous setups these stations are in, check out the follwing pictures from the Titusville, FL reporting station...
...yeah, pretty hard to believe isn't it. Anyone who thinks readings from that location are "accurate" are definitely kidding themselves. Let's just hope this survey leads to some changes in the future so we no longer have to see sights like this!