Again, go to the Preferences under the Limewire tab on the top left corner, then choose the iTunes selection. There you tick the lil' box that says it will enable iTunes support. Tick it and Voila! You get a nice little playlist in iTunes (if there wasn't one already) where all new songs will be transported.
As for old songs, let's not want everything ok? You're gonna have to import them yourself. Yup.

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iMac G4 OSX 10.3.9
RAM 256MB
LW 4.10.5 Basic
ADSL anything from 3 to 8Mbps/around 1024kbps

"Raise your can of Beer on high
And seal your fate forever
Our best years have passed us by
The Golden Age Of Leather"
-Blue Öyster Cult-