Well, it looks like iTunes for Windows isn't for everyone, especially if you're a .net guy with 1000 CDs encoded in WMA. Some of the comments are amusing though, sounding quite closed minded (ie: "it doesn't maximize properly, it sucks"). Personally it is a bit slow I find, and I'm sure it's due to not using native widgets. I can live with that though.
Personally I have all my CDs ripped to .ogg, so I needed to do a bit of fiddling to get ogg support working, but it seems to work fine now. Wish I could rip to .ogg though. It would be nice if there was a WMA codec for it I have to agree for those who do have songs encoded in that format. Support for other devices would be nice too, but that's taking the company line.
Don't forget that iTunes is a loss leader for Apple to sell iPods, and I don't see them having a lot of financial incentive to go out and support every other portable player in the market, when they are doing fine with their iPod sales (or so I assume). Apple producing windows software period should be hailed as the coming of the end of the world anyway, as they are used to having full control over everything, and selling "the whole widget".
As an aside, my buddy silverstr is having trouble getting iTunes to recognize CDs inserted. They play fine in WMP, the GEAR service is running (as suggested here, but no luck. Apple tech support also refused to help him until he bought an iPod (not a good thing if you're testing to make sure something works while considering buying an iPod).