Since this site is not really being overrun with problems stemming from unregistered users, I can't see why I should block their access. Registration is optional.
Right now, what this site needs is TRAFFIC, no matter what or who it is. I certainly hate to think this is going to fizzle out altogether, but there doesn't seem to be enough interest in here for me to worry much about who is saying what. Heck, I checked into TheFiringLine.com, which has been defunct for TWO YEARS, and that site had more visitors right then than this site has EVER had at one time.