The links provided are "MacBroken". Here they are, fixed:

http://www.satisfice.com/articles/hrbt.pdf

http://www.stickyminds.com/getfile.asp?ot=XML&id=13289&#...

http://www.cs.tut.fi/tapahtumat/testaus04/schaefer.pdf

Or maybe it's NoScript getting in the way. Anyway...