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BTW, why do you want to know that? :)

To know which web apps need building next! If a lot of people are still using a desktop app when it can be made a web apps you've got to wonder why..

In that case, then how about a web version of emacs.

There already is one. It's called 9ne

How about a web version of VMWare? Then I could run Firefox, inside of VMWare, inside of Firefox, inside of VMWare, inside of Firefox...