That's a tall order. But full of good stuff. - Not sure if this solves the workflow problem but two (or more) people can share the same cloud storage account b

That's a tall order. But full of good stuff. - Not sure if this solves the workflow problem but two (or more) people can share the same cloud storage account but maintain their own personal login information. The desktop vs. web component can be worked out later - the platform supports this. - Addressed above? - S3 lets you store as much as you want (theoretically). You pay for whatever you use. I don't believe anyone is going to have as seamless an integration as Apple does with iCloud. I think others can get "close enough" while providing other features and functionality which surpass the extreme seamlessness iCloud purports.