The Wikimedia Foundation should get the domain wi.ki, so links to Wikipedia articles could look like this:
Wouldn’t that be fantastic? Instantly recognizable and less typing!
Of course, there should be respective domains for other languages: de.wi.ki, it.wi.ki, etc. An important part of that idea, however, is that the /wiki/ path be dropped from the URL, as it doesn’t serve any purpose for users, as it is.