Current status: iOS4, Cloud 9.

Folders, and Unified Inbox are worth it alone. The rest is just a joyful bonus, for example, I can't wait for background Pandora. Say what you will about "lock-in" - Apple really makes me happy. I don't want things that they don't deliver, I think less about making my compute devices work, and I don't waste frustrated time on unnatural actions (task killer for Android, anyone? - my favourite task killer is the one I *never* think about, or have to use). As a software and experience producer myself, I can certainly see why people love/d working there. 

*** Update *** Pandora, Evernote, and various other apps have already released iOS4-aware updates. Pandora backgrounding absolutely rocks!