You may have heard of these before, but here are some quick links to some websites I quite enjoy: 
 

• The Internet Encyclopaedia of Philosophy - As it says, a massive collection of article on many different philosophical subjects and philosophers. 
• Goodreads - A site that makes it easy to track books you have read, are currently reading and / or will read in the future.  It also has many reviews of many different books.  I found it quite helpful, being a bit of a bookworm. 
• Konami Code Sites - A site that lists other sites that use the Konami Code in some fashion.  Very good. 
• HubbleSite - The site for the Hubble Telescope, including some excellent pictures of SPACE. 
• BLDGBLOG - A site by a man called Geoff Manaugh and has to do with "architectural conjecture, urban speculation and landscape futures."  There are also a couple of article by Jim Rossignol, covering architecture in video games.