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Yet another Microsoft product creeping into Linux. Mono was not enough.
Unlike most .NET supporters, I don't think .NET is the greatest thing since sliced bread. It is a pretty good thing though. Just because Microsoft comes up with something doesn't instantly make it "BAD". .NET brings an entire set of easy to use and fully capable APIs along with countless different languages can use those APIs to create OS agnostic (but perhaps limited to x86 and x64) applications. Sure .NET is slower than native code in most cases and sure it uses more resources than native code in most places. But the rapid application development it allows for while simultaneously supporting such diversity has not really been achieved with much else.
From a corporate standpoint .NET is a fantastic platform for in house development. Development time is crucial so the RAD is a huge plus. And with the advent of Mono most .NET applications can be easily deployed to Windows and Linux servers both 32 and 64 bit all with a single build.
Silverlight / Moonlight simply brings this same environment to a browser.
While there are countless situations where .NET is simply not an appropriate choice, the same can be said for virtually any other software development technology.
No, coming from Microsoft doesn't make it bad from a technical point. It makes it bad because Microsoft is openly campaigning against the Linux platform. There is NO patent protection in using their platform. FOSS is better off steering clear of this technology. Adobe on the other hand, is opening the specs on their products so that GPL'd versions (Gnash and others) will actually work right without having to reverse engineer everything. There are also opening up their development tools to Linux. When Microsoft actually starts working with open standards and file formats, then it will be time to consider their technology.
You have heard of Java, right?
Sounds like Java, what are the major differences between both?