It seems to me that you used to be able to view the thumbnails without signing in, at least that's my recollection. While signing in isn't the most strenuous thing most of us will do in a day, I think it may be preventing non-members or first time visitors from getting a sense of what the contributors to this site can do. It may actually serve to get more people to sign up, but it may also drive folks who are not real computer-friendly away. This isn't a rant, just an observation...
Mike
P.S. When I click on spell-check, I get a message that says, "iespell not detected. Click OK to download page." Naturally, when I click OK nothing happens except the box goes away. Now I'm sure I was born 100 years too late! Bruce, if you've got an extra aluminum foil hat, I think maybe I need one.