It can do all of what this site can do but 1) Be extendable 2) Still be open-source. 3) Allow for more community input (if desired or not if not wanted). And host more rich content.
The color of yellow is debatable Ã¢â¬â is it too much, or a good touch of color??
I also like MediaWiki Ã¢â¬â wiki or cms, its still a good piece of software.