I am using NIS 2010 with the Windows 7 RC. NIS has turned off the Windows 7 firewall, as expected, and it has also turned off Win 7's own network discovery tools.
I realize that NIS 2010 has its own network discovery tools, which is fine, but can they distinguish between private (e.g., home) networks and public (e.g., hotspot) networks and apply separate firewall rules to each, as does Windows 7?
If you check the network map window in NIS2010, there you can find that it is managing every network separately, and the default trust level for them can be good enough for a public network too, but of course you can change it to a safer one too. For a home network Full Trust is good, for a public network Protected or Restricted is OK.
When Norton detects an unsecured network it will automatically set your network trust level to "Protected," which causes the firewall to be more restrictive than it would be on a properly encrypted home wireless network with a trust level of "Trusted" of "Shared."