Nice one. Its a good software, which does the job well. My brother has an iPod, and he uses iDump to make backup of his iPod.
Here are some more free tools to interact with iPod, and are capable iPod managers, like iTunes, and can be used to copy multimedia files from the iPod along with other features.
Floola :
www.floola.com
YamiPod :
http://www.yamipod.com/main/modules/home/
SharePod :
http://www.getsharepod.com/
FroddlePod :
http://www.froddlepod.com/
PodLift(Beta) :
http://www.smash-software.com/PodLift.htm
All are freeware.
I haven't tried these softwares myself, coz I don't have an iPod. So, I don't really know how well they work.
Feel free to try them out, and please do share with me, the experience about these softwares. It will be useful for everyone.