Clonezilla SE (server edition). : It can clone many computers simultaneously, it was used to clone 41 computers simultaneously and It took only about 10 minutes to clone a 5.6 GBytes system image to all 41 computers via multicasting!
Clonezilla support most of the filesystem liek: ext2, ext3, ext4, reiserfs, xfs, jfs of GNU/Linux, FAT, NTFS of MS Windows, and HFS+ of Mac OS. Clonezilla support LVM2 (LVM version 1 is not), also multicast is supported under SE version, you can read the complete feature here .
Now we will see how it works, to do that first download Clonezilla :
Now burn the image ISo in a cd and restart your computer. ( click on screenshots bellow to see full-size image)

Choose you language :
2- Choose to start Clonezilla
3- Choose the mode you want to use , Device to image or device to device
4- Now setup the clonezilla image home directory, you can choose where to save the image for example to you usb drive...
5- Choose which mode beginner or advanced mode
6- Now choose what you want to do if you want to restore an image or creat ean image
7- In my case i choosed to create an image and i choosed to save it under name :
8- Now choose for which disk you want to create the image
9- Now clonezilla will start creating the image , just follow by pressing enter to continue
If you have any problem or you need help to create an image for your disk please post your comment or on our forum.
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We've made the step from Ghost and Acronis to clonezilla to, and it is a good choice. I have customized the live CD/USB for our enviroment so that all the people can do it easily:
http://raymii.org/cms/index.php?title=Customize _Your_Clonezilla_Live_CD
But, as said, thumbs up for clonezilla