You've also managed to piss some people off.
http://blogs.zdnet.com/Ou/?p=358
I was under the impression that you could disable ICS without shutting off your firewall. They are the same service, but you can uncheck "share this connection" or whatever and still have your firewall active.
I don't see a need to disable ICS at all. The chances are very low that someone on your INTERNAL network is going to attack the internet gateway. If so, you deserve it. Who would use a windows box as their gateway/firewall anyway?!
Hardware routers/firewalls are a dime a dozen today and use far less energy than a full blown PC that has to be left on all the time.