Well I think Apple's I-pod have secured their place in market for quite a few months and its not at all easy to replace them although customers are facing problems and MICROSOFT, the name itself talks and what I have heard is they are providing some special features other than I-pods. So, it would be hard to say which one will rule the market till Zune is launched.

well this is 1 topic tht most of us have debated ever since the news of the zune broke out

and honestly being bored by the lengthy debates on number of sites i will just post the highlights differentiating the 2 products:

zune v/s ipod

1. looks: zune-ugly, ipod-classy
2. display: zune-bigger, ipod smaller (3inches for the zune and 2.5 for the ipod)
3. customizable thems: zune-yes, ipod-no (though 3rd party firmwares such as rockbox for the ipod allow customizable themes)
4. bulky: zune-yes, ipod-no
5. external hdd: ipod- by default, zune has to be tweaked
6. sound quality: both r same

ask me a specific question and il answer it can remmber any more points