You can find the SPS 2003 Discovery kit at http://www.microsoft.com/downloads/details.aspx?FamilyID=03607516-cbec-4724-b4a4-aa7f09304ba5&displaylang=en.
A few places in the kit, it assumes you have used the build book. For example, one of the utilities (sample code available) as the domain name hardcoded. You'll have to change the value to make it work on your own server if you didn't use the build book. We'll include a readme with the kit to go through these kind of subtelties.