It's important that you start with the basics before you begin your work with the ISA firewall. By understanding the basics, you'll be able to troubleshoot problems that would otherwise be impossible for you to figure out.
Web Publishing Rules are often a point of confusion because the ISA firewall admin doesn't understand the basics of HTTP and how the ISA firewall manages HTTP connections for Web Publishing Rules. The good news is that Pesach Shelnitz has put together a nice two part article series on how the ISA firewall handles HTTP connections for Web Publishing Rules.
Check out this two part article at:
Great job, Pesach!
Thomas W Shinder, M.D.
GET THE NEW BOOK! Go to http://tinyurl.com/2gpoo8
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MVP — Microsoft Firewalls (ISA)