Do services such as Itunes and products by Apple revolutionize the way you enjoy your music? This is more about the music end and your ability to enjoy rather than the actual technology involved.
I love iTunes. It is very fast, easy to use, and has great features. There is absolutely no comparison between iTunes and such services as Windows Media Player or RealPlayer. Playlists are clean and easy to setup and change. The service is very flexible in that it will deal with a good number of formats.
I don't even have an iPod yet, and iTunes is the only music program that I use at home.
I have no negative comments about iTunes. This music program has made my life so much easier. There's nothing that could really compare to it.
There are a lot of accusations about Itunes creating a music monopoly. Steve Jobs is being asked to account for it. Read more under the Steve Jobs Thread.