madmac - 2:09 am on Aug 13, 2005 (gmt 0)

>> Have you heard something that might challenge the validity of this?

for a patent to be valid, it must be non-obvious. If challenged, I personally would think this patent would loose. But, somebody has to challenge it... and challenging anything in the legal system comes at an extremely high price... a price so high, even Amazon.com was not willing to bear.