I'm still using NT 4.0 Servers in my shop to support 40 users. My servers run great and are stable with SP6a. I'm in no rush to upgrade to Win2K or Win2003 server.
Active Directory does not provide any additional benefit over the NT domain model in a small business setting. Since we do not use MS Exchange for email, I really see no immediate reason to upgrade. I'm quite satisfied with NT's performance.
Any else enjoy their NT Servers? Planning to upgrade to Win2k or Win2003?