hey i love limewire, and i got all of my songs from there...
heres how you import them to iTunes:
1. go to wherever your songs are being saved (mine are under Start > My Documents > LimeWire > Saved)
2. (just to make sure...) right click on any song, and there should be something about "Open with" --> make sure that is iTunes
3. double-click on that saved song, and it should directly import itself into your iTunes library