On the one hand I usually love to drop in a bit of spolsky wisdom myself, and that quote stands well on its own, but the article itself is unfortunately marred by the fact the Microsoft products mentioned were just unsuccessful early attempts at iCloud and Google Accounts, both of which have since seen considerable "killer app" level success. I guess easy with hindsight to say "ah yes, but smartphones".
I once saw a fascinating quote that went something like the following:
"As computing technology develops it becomes more efficient to take centralised computing resources and distribute them closer to the user. As network technology develops it becomes more efficient to centralise them again. Further advances redistribute and yet further advances recentralise. This pattern has been noticed several times in the history of computation."
And the most fascinating thing was that it was from decades ago, perhaps even 1960! I've never been able to find the quote again. Does anyone recognise it? Perhaps I imagined it.