Have you heard that NASA in cooperation with the US gov and the European Union has established the future replacement for the World Wide Web?
It is called the "Great Galactic Grid", and obviously for the foreseeable future it will be limited to this solar system (unless we are contacted soon), but if they have learned anything from the Internet, it is that it pays to think big, early!
The GGG will be backwards compatible with the WWW, fortunately. Of course it is still early in the game, since we don't yet have any functional colonies on the other planets, but in order to help funding the development they let you buy domains for $500 each, which gives you nothing but bragging rights and something to tell your great-grandchildren when they live on Mars.
I purchased domains for three of my existing web sites:
(my personal site)
(artistic nude photography)
(for artists and Mac users)
You can pay for your domains at:
... OK, I better come clean: this was partly a joke. I invented the Great Galactic Grid (in mid-2004).
But I also fervently hope it comes to reality during this century. If and when it does, remember who invented the term. :)