The differences between Chrome and Chromium are minimal - aside of Chrome bunding some mostly unwanted plugins:

http://code.google.com/p/chromium/wiki/ChromiumBrowserVsGoog...

That list appears to be incomplete. For example, there is a windows-specific closed source software renderer for WebGL that is in Chrome and not Chromium.

Good lord those comments gave me a headache. How do people manage to find that page if they can't manage to figure out what Chrome or Chromium are in the first place?

You're free to run Chromium instead of Chrome. I do.