I was initially excited about the UI design philosophy of Win8 Metro. But then I realized that HTML5 can do 95% of what Metro can, and also be truly cross-platform.
I see HTML5 as the cross-platform holy grail that developers have been
seeking since the WORA days of Java 15 years ago. First it was supposed
to be Java, then Microsoft embraced and extinguished it, and besides it
had too big of a footprint download (and a clumsy download process to
boot). Then Flash was supposed to be the universal small-footprint. It
was just about to take off, then Apple extinguished it by not supporting
it at all (completely skipping the "embracing" step). Then Microsoft
finally decided to stop holding back .NET from web development -- the
purpose for which it seemingly was originally designed but never
delivered upon until Silverlight. But by then Windows market share was
too small for Microsoft to force a Windows-only solution on the web
HTML5 is W3C standard. It's not Sun. It's not Adobe. It's not Microsoft. It's W3C.
HTML5 is the holy grail of WORA.