It doesn't have all the great learning resources that tryfsharp has but I believe tryfs.net works by sending the code for compilation on the server so you don't need silverlight:
It's being used commercially in a number of companies. Off the top of my head: Credit Suisse, Aviva, Trayport, Gamesys as well as quite a few hedge funds on both sides of the pond.
MS is not abandoning F#. This is a community-led effort to try to increase adoption of an excellent language and to create a better experience on non-microsoft platforms.
This isn't strictly true. You can get "corked" wines under screw-cap or synthetic closures but it is a lot rarer. TCA can find its way just about anywhere.
