I've said it before, and iBall just mentioned it, but there is no other MP3 player that even comes close to the iPod in terms of support.
There is litterally TONS of of software geared just to the iPod.
I'll be damned if you can even find a program for OSX or Linux that even works with the Zen. If you do, it's out of shear coincidence...
Face it, the only reason you guys are against the iPod, is because it's the biggest, and most popular... If you switched Zen with the iPod, you'd all be saying how much the Zen sucks, and how great the iPod is.