As a computer scientist and an Opera user this actually insults me: http://i.imgur.com/7k0bN.png Ironically Opera was the one who proposed the -tag which this site uses for it's rotating LP, in 2007. [1] Way to exclude users. [1]: http://en.wikipedia.org/wiki/HTML5_video#History_of_.3Cvideo...
The Web 2.0 craze is leading us back to the "Best viewed with" insanity of the 90's. And is only going to get worse, with WebGL is not just "Sorry your browser is not supported, please download a different one." , but "Your video card drivers are not supported, buy new hardware and/or install a different Operating System"
This is a ridiculous idea, and a ridiculous comment. I'm a web developer and I'm so excited about making awesome things and the fact that the web is evolving and enabling us to do this, and share our creations with the world. People like you and comments like this drive me crazy.
That being said, I don't think that you should just put up a blanket disabled site announcement when it's not necessary (as is the case with opera here), but if your computer or browser is actually missing capabilities because it's too old, that's too bad - you just don't get cool things. Upgrade or move on.