Yeah that CDBurn tool in the 2003 Resource Kit that Rad and Al talk about, looks like the tool I got from a MS TAM a year and a half ago.

Used it to burn a Server 2003 CD from a MS download that was in zip format, not ISO. Used a couple other tools to make it bootable, then burned it from CMD console.

Looks like they finally released it to the public.

Windows Server 2003 Resource Kit Tools
http://www.microsoft.com/downloads/details.aspx?familyid=9d467a69-57ff-4ae7-96ee-b18c4790cffd&displaylang=en

The following tools are provided:
Cdburn.exe: ISO CD-ROM Burner Tool