Just upgraded my 3GZ to iOS4 and am greatly enjoying the ability to use folders and to multi-task Pandora. Can’t wait for Last.fm, which has far fewer repeats. Supposed to be available at the end of the week.
As part of the upgrade I noticed that iBooks is now available. I downloaded it, but will never buy a book from Apple. It’s OK for public domain stuff, but I can’t imagine why anyone would buy books from Apple and then restrict themselves forever to reading on Apple equipment. At least with Kobo, Amazon, etc. I can read on several different hardware platforms. As much as I love my Apple stuff, I may want to change hardware some day, especially with phones, Android looks more and more interesting, and to lock myself in forever doesn’t make much sense to me.