This is a script I created for checking the amount of free space 
on our servers at work.  With most of our servers still being server 2003, 
and dell having set the drive c partion to 12gigs, they fill up 
just through doing updates, and if you put any programs at all on the 
server (such as wsus).  This script will also e-mail you if drive c gets 
below 1gig worth of free space (if you set some of the variables at the 
top). 
drv-space.bat
note: if you do want it to e-mail you you will need a copy of 
blat.exe put into a folder, and you set the blatexe variable in the bat 
file to where you put blat.exe
 blat is avilable at http://www.blat.net