Spam or not, i think this is a good topic. I think Airless or Airfree tires are great for wheelchairs, and kids bikes, and maybe for the people who ride under 100 miles a month. I cant imagine using them for more serious cycling.

After a few min of searching, i did find these other airfree tire websites, interesting, but not for me

http://www.airfreetires.com/Default.htm
http://www.rmairlesstires.com/rmat.asp?page=home
http://sheldonbrown.com/tires.html#airless

As Sheldon Brown puts it "Airless tire schemes have also been used by con artists to gull unsuspecting investors. My advice is to avoid this long-obsolete system."