The System Guard - A family of Windows-scripting related products. Command libraries provide API-like functionality to .cmd files with a specific emphasis on writing reliable cross-platform shell scripts. - http://thesystemguard.com/
The Wizard's Apprentice - Application that can ask questions from batch files with user friendly Windows dialog boxes; Cancel, Back and Next buttons. - http://wizapp.sourceforge.net/
Batch Script Collection - MS-DOS, Win 95+, NT, and some cross compatibility batches. - http://www.fpschultze.de/bsc.htm
NT Command Reference - An A-Z Index of the Windows NT command line. - http://www.ss64.com/nt/index.html
Win32 Scripting - Shell, Visual Basic, downloads, examples, reference materials, and technical support via message board. - http://cwashington.netreach.net/depo/default.asp?topic=repository&scripttype=command
Windows NT/2000 FAQ - Wide range of topics including command prompt and batch. Submit your own FAQ, ask a technical question. - http://www.windows2000faq.com/Articles/Index.cfm?DepartmentID=769
The Windows NT Command Shell - What it is, what it does, and how to use it. Chapter 2 from "Windows NT Shell Scripting", by Timothy Hill, Linda Engelman. - http://www.microsoft.com/technet/prodtechnol/winntas/deploy/prodspecs/shellscr.asp?frame=true
Scripting and Batch Programming - Command line interface, environmental variables, logon, Windows Scripting Host, Visual Basic, Perl. - http://www.labmice.net/scripting/default.htm