Per duesi's post, I recommend Drive Image from PowerQuest - particularly the new version 7 of it. It can create an image of your partition or entire drive, even the one that you boot from, while it is in use. There is no need to boot to DOS with a startup disk in order to create the image. Doing it "online" also allows the image to be written to any device that the O.S. can write to (network, CD-R, CD-RW, USB hard drive, etc.) - not limited to specific devices or hardware that's directly connected to your machine or limited to the devices that the very small, limited boot floppy can support. It also comes with an emergency startup CD that you can boot from for use with restoring the image if you need to. I use it on my WinXP laptop, and it works great.
