Hello, as long as your songs are still on your iPod, you can get them back to your computer and iTunes easily.
The most convenient and secure way is to use an iPod-to-computer transfer program to help you, like this handy one called Tansee iPod Transfer
http://www.gutensoft.com/Utilities/Tansee-iPod-Transfer.htm
Many of my friends are using it for its easy and safe transfer. The whole process goes as follows:
Firstly install this program on your computer. When you plug your iPod to the computer, this program will instantly display all songs and videos on the iPod.You simply select what you wish to transfer and click "Copy" button. Done. All your selected files will be copied to your computer safely. Now you can easily add those songs and videos to your iTunes library. See detailed guide.
More importantly, this won't overwrite any original files on your iPod. And all song names are preserved.
Here is step-by-step guide on the whole process:
http://gutensoft.com/Guide/How-to-transfer-songs-and-videos-from-ipod-to-computer.htm
Best luck!
You can also search more other ways at http://ask.com