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I think what comes closest to that is Evernote
You can aggregate all manner of things, more info here -
Getting Started With Evernote. | Evernote Corporation (look through the 7 points)
Evernote Trunk | Evernote Corporation (check the tabs at top)
Cloud, web, PC, Mac and Android, a nearly complete document fusion system.
Can't say about the tree view for following document hierarchies, but I think this is the closest you'll find.
Spring pad looks very interesting. Ideally, I would like an app that syncs between my Android phone (HTC Desire), my laptop and my iPad2. Springpad is available in both the Market and the App Store but I can't work out if it will sync automatically or not. Can anyone help please?
A good alternative for richer content is Evernote
