A few new service packs are now available.

.NET Framework 1.1 SP1 for WS03

http://www.microsoft.com/downloads/details.aspx?FamilyId=AE7EDEF7-2CB7-4864-8623-A1038563DF23

.NET Framework 1.1 SP1

http://www.microsoft.com/downloads/details.aspx?FamilyId=A8F5654F-088E-40B2-BBDB-A83353618B38

.NET Framework 1.0 SP3

http://www.microsoft.com/downloads/details.aspx?FamilyId=6978D761-4A92-4106-A9BC-83E78D4ABC5B