I like StumbleUpon; I've been going to this site quasi-religiously for several months now, and I continue to be amazed at the very cool things I find through this it. The makers and operators of the site describe it as the place to go to "find the very best of the Web", and I have to agree with them. The content is for everyone, as there is a little bit of everything, from the hilarious to the very serious, and everything in between! I am always so impressed by the things people come up with!
I highly suggest that you bookmark StumbleUpon, and soon, you'll be stumbling upon a whole lot of interesting stuff online.