I thought I was the only person who still owned/uses a Zune. I use mine all of the time but still can't figure out how to get .wmv (yeah, Windows media) files to load on it.
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I have a Zune HD. Can't say I use it much after getting a smart phone.
Limewire
1 on Banshee. Check it out here.
I used to use Rythmbox but recently switched to Banshee.
At this point the only downside to switching away from iTunes is if you use the iTunes store.