Have you looked at
The Intrusion Detection Log? Both Imric and I have tried port scans on your IP, these should have shown up on this log if they made it to your router.
Another thing you can try is connecting your server directly to the DSL modem. See if your web server shows up then. You should probably have Black Ice running to protect yourself, just make sure you can open up port 80. Also make sure your security updates are current.
~~~)-Steven----
"I want you to remember that no bastard ever won a war by dying for his country.
He won it by making the other poor dumb bastard die for his country..."
General George S. Patton