I recently bought a NW-HD1... yes I know the HD3 and HD5 are out but the HD1 is cheaper and has a much better design and the other two just didn't have any extra features that told me they were better than the NW-HD1.. 1.But I heard NW-HD1 doesn't use playlists it uses 'Groups'. What exactly are groups and what's the difference between a Group and a playlist? 2. I've also heard that when using SonicStage to transfer songs onto your HD1 that sometimes a song is put on their twice because its in a different group... how does this happen? Thanks in advance.