Patches are available as listed in the advisory below. I have also heard that SP3 for NT is now available, but I've also heard that it's not a complete fix for the problem described below. More news as it becomes available.
Unsaved data is lost.
Apply the countermeasures described below for firewall configuration and local Microsoft patch. The port most susceptible is TCP Port 139, the Netbios Session Service port. Although port 139 is the most commonly attacked port, there is potential for successful attacks on other ports as well. Except for losing the contents of unsaved documents and files, there are no long-lasting effects from this attack. This is a blue screen alerting the user that an application is not responding.