another way to get your limewire (LM) tunes into your itunes playlist and onto your ipod is to copy the mp3's directly from the LM save directory.
This is the directory you specified when you installed LM to put stuff.

Look at your LM preferences to determine the location of the directory. Copy to/from using 2 finder windows. You might have some naming issues, ie songs might be stuck in unknown artist or something, but you can work it out.