Task #3 is one of those things where you have a moment of recognition and say, "That's what they call it. I've been doing that for years."
To me, the biggest advantage of Cloud Computing is the proliferation of small computers. Notebooks are really starting to take off and a lot of cell-phones are beefed up to include features that you used to only see on desktop computers. Add in the fact that Wi-Fi is constantly becoming cheaper and more accessable.
In order to save memory and computing power, instead of having software installed, you just use the online options whenever possible. This way, instead of having a dozen computers rooted to one spot, you could have two dozen notebooks for the same price that a patron can use anywhere in the library.