GreyMagic announced 9 vulnerabilities they found with caching in IE 5.5 and 6.0. Apparently prior versions aren't affected. IE 6.0 SP1 isn't affected either. The text to their bulletin:
http://security.greymagic.com/adv/gm012-ie/
According to InfoSec News (ISN], GreyMagic didn't give MS any advance notice about the bugs before releasing the information to the public.
K. Brian Kelley
http://www.truthsolutions.com/
Author: Start to Finish Guide to SQL Server Performance Monitoring
http://www.netimpress.com/shop/product.asp?ProductID=NI-SQL1
K. Brian Kelley
@kbriankelley