Alan Bourke - I disagree
What's wrong with HTML 5. It's HTML, that's what wrong with it.
Alan - if you think that Silverlight is superior to HTML then you are certainly unqualified to discuss the merits of browser pugin technologies.
If you have poor moral standards and think that supporting monopolies is OK then carry on blowing your trumpet for the OS agenda inspired Silverlight.
Personally, I will carry on creating professional web applications which work on EVERY web browser and every platform.
Also, your claim that Linux developers slag Silverlight off without understanding the technology is completely false. I understand the technology perfectly well and I can see that there are some merits to the architecture when compared to some areas of Flash. However, Adobe have at least made a stable 32bit and 64bit plugin for Linux.
Whether you like it or not, Linux has a big future and it is completely irresponsible to develop web sites or applications that are unlikely to function on it. A big part of web development is accessibility - if the site will never work for 1% of operating systems then you are making the site in-accessible for those users.