Windows NT IPConfig GUI
Use this GUI utility instead of using the "ipconfig" command from a DOS prompt in Windows NT/2000/XP

SysInternals Utilities
The Sysinternals web site provides you with FREE advanced utilities, technical information, and source code related to Windows NT/2000/XP/2K3 and Windows 9x, Windows Me internals that you won't find anywhere else. This is not for the light of heart. The stuff here is very technical, but the tools are incredible. It might just be fun for you to play with some of this stuff.

Network Magic
This software is not FREE, but it will solve your Windows networking problems. If you haven't experienced it yet, networking two or more Windows computer, without a server, is a pain in the tush. Network Magic makes it easy and is well worth the price. You can take it for a test spin with the FREE trial.