Under Control Panel > Windows Firewall > Exceptions > Programs and Services check File and Printer Sharing. This allows WINS-capable clients to resolve the IP address from the NETBIOS name.

Next choose Windows Firewall > Exceptions > Add Port... and enter TCP:80 for IIS. Also, you may need TCP:22 in case you have OpenSSH installed.

For further reading, see "Innovations in Internet Information Services Let You Tightly Guard Secure Data and Server Processes" here:

http://msdn.microsoft.com/msdnmag/
    issues/02/09/securityiniis60/default.aspx

and "Troubleshooting IIS and ASP.NET Settings Import" here:

http://msdn2.microsoft.com/en-us/library/ms182001(VS.80).aspx