Some Math Related Links

• LaTex Math Wikibooks
  
• Wolfram Alpha
  
• Java Applets for John Polking at Rice University's DField and PPlane.
  
• A good collection of articles on the Maslov Index
  
• Project Euler
  

Some Math Communities Online

• Mathematics Stack Exchange
• Math Overflow
  
• reddit/r/math
  

Non-Math links

• UNC Basketball - Go Heels!
  
• Project Gutenberg - Some free books online
  
• Project Gutenberg Australia - some more free books for Australia
  
• It's been a long time since they were relevant 49ers football
• Some nerdy webcomics: xkcd and PhD Comics