It looks like the old Garry's Mod Resource Web site (garrysmod.org) has finally retired...

SO,

I thought I'd get this out there before the questions start flying...

So, here you go!!!

This is the code for the bat file I use in the video...
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@echo off
SET var=%~d0%~p0gmad.exe
cd %~d0%~p0
:Loop
if %1=="" GOTO End
call "%var%" extract -file "%~f1" -out "%~n1"
SHIFT
GOTO Loop
Echo "OhOh!"
:End
exit

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