Resources

Free up to date NCAV screen
http://www.grahaminvestor.com/screens/graham-number-ncav-screen/

Spin-offs
http://www.stockspinoffs.com/
http://www.rocketfinancial.com/spinoffs/

Warrants
http://www.stockwarrants.com/Default_high_res.htm

Tracking insider transactions
http://insidertrading.org/

Letters from hedgefund managers - sometimes stale and missing
http://www.hedgefundletters.com/

Berkshire Hathaway Letters to Shareholders 1977-2011

http://www.berkshirehathaway.com/letters/letters.html

Warrent Buffet Letters to Partners 1959-1975
http://www.rbcpa.com/WEB_letters/WEB_Letters_pre_berkshireTURNEDOFF.html

Graham Newman Letters 1945-1958
http://www.rbcpa.com/benjamin_graham/Graham-Newman_letters.html

Charlie Munger's Letters to Westco shlds 1997-2009
http://www.wescofinancial.com/page2.html

US Economic Data
http://research.stlouisfed.org/