StumbleUpon is a web browser plugin that allows its users to discover and rate webpages, photos, videos, and news articles. Well...when you're bored just click "stumble!" and a site appears. Who knows you might find something interesting. Many people say it's quite addictive as you might want to stumble upon more sites as it gets interesting. I agree with that too.
I have download the toolbar just for easy use. The toolbar is available for both Internet Explrer 7.0 and Mozilla Firefox. Get the toolbar here.
Here are some sites which i have stumbled upon....
http://musicovery.com/
This site lets you play music from all genres, from jazz to classical to rap to pop and many others. Besides that you can restrict the music to a certain period of time, for example from the 80s to 90s. You can also choose your mood of music.
http://www.behance.net/Gallery/Stop-Haunt-Me-Everyday-Collection/53669
It resembles a picture of a woman. It certainly is great art but i have no idea how it's done.
http://www.100mb.nl/
If you think that this a photoshop generated image then you're wrong. The penguin is made out of letters combined together. Click to see for yourself.
http://billychasen.com/clock/
A human clock.