InfoWorld reports that the Exploit Code for Microsoft Windows latest Workstation Service Buffer Overflow now exists in the wild.
The exploit code was posted on a french website called www.k-otik.net on 14 November by someone called "Snooq". The code is remarkably easy to find but I am unable to provide a link for ethical reasons.
I admit I never did install the patch (and probably will not for awhile) but if you are bothered by such vulnerabilities, I think you should get this MS03-049 patch.
If you are like me and do not like to rely on Microsoft to fix the holes in your software, then have a look at Windows XP Service Configurations and Minimisation of Network Services on Windows Systems.