Little known "Websites" you should know about

Whats not to love about Reddit yet again.

http://www.reddit.com/r/AskReddit/comments/rrmhm/whats_a_little_known_website_everyone_should_know/


Fun ones
http://www.rainymood.com/
http://www.hackertyper.com/


Serious sites
http://www.monoprice.com/
http://www.mcmaster.com/
http://ocw.mit.edu/courses/
http://backblaze.com/
http://www.oldversion.com/
http://www.gutenberg.org/