Reading through this whole thread I just have to wonder - if the folks who are planning to compile this list will truly be distributing that information via leaflets, etc. at various gatherings, gun shows, etc., then it seems that it shouldn't be difficult to wait a month or so and watch for them to show up. At that time, it should be very easy to identify who sent this -whether it be Cease Fire, WCFA or someone else. If they don't show at all, then it was just a ruse meant to stir the pot - and it certainly has done that.
A couple of you seem to be missing the point of the letter- it's to sponsors of NWFA. To get them to STOP financially supporting NWFA. The letter isn't addressed to NWFA- it went out to those who support us.
The author likely never intended any of US to read it.