!G4U 
Ghost for Unix is an open source imaging program which fits on a 2.88 MB floppy disk (if you can find one of those).  Alternatively, you can download the ISO files from http://www.feyrer.de/g4u/ . Burn it to a CD and run it. It shows you all the commands you'd normally run, but here's the general way we slurp a disk.
#slurpdisk administrator@144.92.235.16 funtimes.gz 
#enter your password
#Wait a few hours (depending on how many you are slurping) 
!If something goes wrong
*Type "disks" to see what hard drives are currently installed and running on the system.
*Type "ipconfig -a" to see whether or not the NIC is configured properly.
*Typical speeds are anywhere between 20MB/sec and 2MB/sec.  Generally, slurping 10 and a time is an efficient way to go about imaging the labs. (Plus it doesn't interfere with everyone's schedules)
!Warning
It doesn't seem to work on the [380] Dell computers, that's why [BartPE] was introduced. 
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Also try slurping parts with slurppart hda1 this should allow you to just write over the existing partitions, but whether or not it works is really up to how careful you are.  
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Don't forget that a boot loader can fix a lot of problems you cause by errant slurping of disks.