1. Youtube I LOVE it. It gets better and better every day. Only thing i miss is p0rn.
2. Wikipedia I so often use it each day. It knows nearly everything and the information in it is usualy more worth then stuff you find on a random google page about the theme.
3. maps.google Satelite pictures of half the world. It's awesome. On the one hand it makes you feel like an ant. On the other hand you see how relatively small the world is. It's kinda depressing tho to see how much impact humans have on the surface of the planet.
4. Internet Radios Whats the point in listening to the same CD's or mp3's again and again when there is a whole world full of new and quality music each day?