How to sync an iPod without deleting the old music?

Question: I got a new computer and just installed iTunes 9.0 on it. This iTunes 9.0 is a complete new one. Now I really want to transfer this iTunes 9.0 library to my iPod. How could I do this, anybody help?

Once you sync your iPod to to this iTunes 9.0, of course the iTunes 9.0 playlist will sync your iPod, but all the old music on your iPod will be deleted after the syncing. If you want to sync the iPod without deleting the old music, you should get some iPod transfer tool.

iMacsoft iPod to Mac Transfer - professional tool to sync an iPod without deleting old music on Mac!

To bring in new music to iPod, to have no loss of any old music on it, iMacsoft iPod to Mac Transfer will be the right tool for you to accomplish this. It is an all-in-one iPod to iTunes, iPod to Mac, iPod to iPod Transfer for you to sync an iPod without deleting the old music. The following guide below will direct you how to sync an iPod without deleting the old music.
1.download, install and run the software
All information about your iPod, such as type, capacity, version, serial number, and format, will be shown on the main interface.
Tip: All functions for iPod are applicable to iPhone, iPhone 3G, iPhone 3GS, iPhone 4 as well except for the photo management.

2. Sync an iPod without deleting the old music
1) Open the library/playlist that you want to transfer.
2) Click the "Add Files to iPod" or "Add Folder to iPod" button.

4. Edit iPod Playlist
To those who want to create their own personalized iPod Playlist, you can try this function.
Choose the "File -> Playlist" option to create a new list, and then choose the "New Playlist" option from the submenu.
Drag & drop to import or export files need and drag it to the local, or you can choose the file from the local and drag it to the iPod.