The only Norton product that works is Norton 360 2009 Beta 3
and with mixed results. Kaspersky also gives mixed results. The only fault-free anti-virus I've found that works on Windows 7 is Avast Free. Windows Firewall is improved on Windows 7 so suffices in lieu of a good software firewall. Comodo Security Suite provides a rather cumbersome way of giving yourself a software firewall and is by no means satisfactory and is hell to remove if and when you choose to.
The subject has been flogged to death on the Seven Forums
FYI on our last conference call with McAfee management I already broached the subject of Norton being "ahead of the game" and I got the answer that while McAfee will continue with the policy of not supporting anything beta, a future beta
version may support Windows 7 Beta. So I guess that you should stay tuned to the beta website linked in THIS
post and to Microsoft's "partner" web page
which mentions that other partners will be added in due course.