If you are like me and enjoy reading about random crap (I use to go my public library and read random articles from encyclopedias) I highly reccomend this website. I wonder how many encyclopedias are still sold in the us anually, its hard to imagine them competing with Wikipedia.
Kind of self explanatory. Usually they keep stuff simple, but if you want added depth, they usually link to more in depth explanations.
Unheard of high quality wallpapers can be found at this website.
A fucking addicting game can be found here, has the added bonus that you can tell your annoyed girlfriend/boyfriend or spouse that you are actually being productive by helping to cure diseases!