If you want to see whats in your Zune using a Mac and XNJB it would be a bad idea to update your firmware to the 1.1 version. prince_alfie (aka Albert Wang) just informed us he did and regretted it: "Actually it gives an error signal in the log after all. It just won't connect indeed :)". In any case he keeps smiling, he has other interesting things to do with his Macs!

More info: Mac and Linux support for Zune.