It's utility that among other things can help you retrieve files from your iPod. You can read about it at this link:
YamiPod It's well documented so there are a lot of support pages for it's various features.
There are a number of third party utilities that you can use to retrieve the files from your iPod. This is just a selection.
PodUtil Mac and Windows Versions
iPodCopy Mac and Windows Versions
PodPlayer Windows Only
iPodAgent Windows Only
Senuti Mac Only
There is also a manual method of accessing the iPod's hard drive through Windows posted in this thread:
iPod to iTunes
If your iPod is set for automatic update, when you connect you will get a message that your iPod is linked to a different library and asking if you want to link to this one and replace all your songs etc, click
*No*. Your iPod should appear in the iTunes source list. Change the update setting in Preferences>iPod to "manually manage songs and playlists
Managing Your Songs Manually
You can also use a keyboard command to prevent your iPod auto-syncing with iTunes. While connecting the iPod to the computer hold down the Shift + Ctrl keys (on a Mac hold down the Option and Command (⌥ and ⌘) keys). This will stop the iPod from auto-syncing with iTunes and the iPod will appear in the source list. Wait until you are sure the iPod has mounted, and that it will not auto sync and then you can let the keys go. This may take between 3 and 30 seconds depending on your computer. Then go to Preferences>iPod and check the "Manually manage songs and playlists" box.
Keep your iPod in manual mode until you have reloaded your iTunes and you are happy with your playlists etc then it will be safe to return it auto-sync again.