Importing your iPod content into iTunes after using Pod to PC or Pod to Mac takes just one step. After opening iTunes, dive into the iTunes File menu, find the Library submenu, and select the option for Import Playlist. After pointing iTunes to the playlist that Pod to PC created on your desktop, all you need to do is sit back and watch as iTunes sucks in all your transferred media.
To see how the process works, CNET's Tom Merrit made a handy video that walks you through the steps for retrieving files from an iPhone. The process is identical for iPods, so don't feel left out when Tom says "iPhone"--just overdub it in your mind.