Here are some links that I frequently use, feel free to look around.

Useful Stuff:
GMail
Google
Google Maps
Kahn Academy
Damodaran Online

Reading:
AnandTech
Ars Technica
Slashdot
Hacker News
Reddit

Funny:
xkcd
PHD Comics
Amazing Super Powers
The Best Page in the Universe
The Onion

Web logs:
Paul Graham
Seth Godin
Tom Peters
Joel on Software
Larry Smith
Matt Might
Filter Joe
Musings on Markets (Professor Damodaran)
Sutter’s Mill
Jeff Atwood

School:
UofT Electrical and Computer Engineering
University Of Toronto – My Graduate University.
University Of Waterloo – My Undergraduate University.
Andreas Veneris – My PhD Advisor’s page.

Finance:
Motley Fool Discussion Boards
ADVFN
Rotman Business Information Centre (bic)
Rotman Business Information Centre (bic) Databases
Seeking Alpha Transcripts
History of Berkshire Hathaway
The Brooklyn Investor
Corner of Berkshire and Fairfax
Oaktree Capital Memos
Berkshire Hathaway Annual Reports