I agree with diki. They should have at least a line in possibillity.
I am looking myselve for one at the moment and the only one I found with easy handling is one Zen model from creative.
With easy handling I mean no additional software to install to get it working.
My daughter has an Ipod and a PSP.
Both need software to get the PC connection.
The PSP is not compatible with all usb 2 ports and sucks big time in handling overall.
The Itunes software is taking too much resources from your pc memory and has bugs as well.
My son has a creative zen model which works like a charm without any software.
Plug in and use ms explorer.
The only downer on the ZEN model that has a line in, is that this comes only with a 5gig harddisc.
I probably wait till creative comes with a line in on the newer models with at least 30Gig.
I don't know the ZUNE.
Fred
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76