Just some tidbits I found on WSJ online:
Cons:
Placing the Zune next to the 30-gigabyte iPod provides a strong contrast. The iPod is thin, sleek and elegant looking. The Zune looks big and blocky, sort of like a prototype for a gadget, rather than a finished product. It is longer, thicker and heavier than even the 80-gigabyte iPod, which has more than twice its capacity.
Zune was adapted from a much-praised but slight-selling music player, the Toshiba Gigabeat, in order to get it to market more quickly.
But the wireless music-sharing feature on the Zune is heavily compromised, in a way that is bound to annoy the very audience it is targeting. Each song sent to your Zune from another Zune can be played only three times and is available for playing for only three days. After that, it dies and can't be played again unless you buy it. Even if you play the song only halfway through, or for one minute, that counts as one of your three allowed plays. In fact, in my tests, a song I sent to my assistant's Zune expired after only two plays, one of which lasted just a few seconds. Microsoft attributed that to a bug that it said would be fixed.
Even worse, to buy even a single 99-cent song from the Zune store, you have to purchase blocks of "points" from Microsoft, in increments of at least $5. You can't just click and have the 99 cents deducted from a credit card, as you can with iTunes. You must first add points to your account, then buy songs with these points. So, even if you are buying only one song, you have to allow Microsoft, one of the world's richest companies, to hold on to at least $4.01 of your money until you buy another. And the point system is deceptive. Songs are priced at 79 points, which some people might think means 79 cents. But 79 points actually cost 99 cents.
Pros:
Zune has several nice features the iPod lacks: a larger screen, the ability to exchange songs with other Zunes wirelessly and a built-in FM radio. It solves the worst problem that plagued earlier Microsoft-based music players -- frequent failures to synchronize properly music and videos between the players and personal computers. Synchronization on the Zune is smooth and sure.
Also, the Zune player and software have a very good user interface, different from, but in some cases easier to use than, the iPod's. While it lacks the famous iPod scroll wheel, instead using a common four-way navigation pad, I found song lists easy to navigate on the Zune. It has only a few buttons and is quite intuitive to use. To my ears, it sounded as good as the iPod.