The following are some sites we like to refer to. 

 

Clipper Fund Value oriented, with long term investment horizon
Tweedy, Browne Value Investors
Northern Trust Nice commentary section
Georgia Tech - College of Management Interesting working papers
Weitz Funds Managed by Wally Weitz
J. V. Bruni and Company Good resource with book reviews
Berkshire Hathaway self explanatory
Sequoia Fund hall of fame fund for sure
BeEarly.com Interesting graphs and commentaries
PIMCO I like to read Bill Gross
Davis Funds Long term investors
Legg Mason Value Trust Interesting to see what Bill Miller is up to.
Oakmark Funds Bill Nygren
Longleaf Partners Mason Hawkins, CFA
Third Avenue Value Funds Marty Whitman
GMO Jeremy Grantham
Dreman Value Management David Dreman
Zweig Funds Marty Zweig
Muhlenkamp & Company Ron Muhlenkamp
Bogle Financial Markets Research Center Vanguard's Founder - John Bogle
Baron Funds Ron Baron
Sarbit Asset Management Larry Sarbit - interesting Buffett stuff
West Coast Asset Management Founder of Kinko's
The Olstein Funds Haven't reviewed, but an advisor I respect reads this
Oak Value Fund Haven't reviewed, but an advisor I respect reads this
BrandyWine Funds Haven't reviewed, but an advisor I respect reads this
Fairholme Funds Haven't reviewed, but an advisor I respect reads this
Werlinich Asset Management I came across this, have no idea of performance, but enjoy his letter.
Martin Capital Management Interesting letters - very in-depth