After seeing this thread's interesting title, I decided to check the page source and see if the URL, where it was linked, was properly URL encoded. It was not. I checked both the this page and this page, and neither of them URL encoded it as:

http://www.gamedev.net/topic/642153-%E2%99%AAmarble%E3%83%BBtime%E2%98%85ost%E2%98%85release%E2%99%AA

Like they ought to have.

Just an FYI.

As far as I know, both methods are valid, it's just that encoding is preferred for security reasons (makes it harder to spoof another URL by using similar characters). Well, and maybe compatibility with some servers, but maybe browsers rewrite the URLs under the hood to work around that.