Follow our regular commentary on Twitter here
I recommend bookmarking and regularly visiting the sites listed below. It's a partial list and our apologies for failing to list many others that are equally excellent.
Michael Batnick
Bespoke
Charlie Bilello
Josh Brown
Thomas Bulkowski
Calculated Risk
Tony Caldaro
Ben Carlson
Cobra Chart Book
Steve Deppe
Ryan Detrick
Mark Dow
Tim Duy
Eddy Elfenbein
FactSet
Federal Reserve Bank of St Louis
Financial Sense
Carl Futia
Scott Grannis
Morgan Housel
Mark Hulbert
ICI
Index Indicators
JPM Guide To The Markets
Matt Levine
Howard Lindzon
Dana Lyons
Tom McClellan
McMillan Option Strategist
Helene Meisler
Darren Miller
PastStat
Quantifiable Edges
Barry Ritholtz
Cullen Roche
Schaeffer's
SentimenTrader
Brian Shannon
Doug Short
Liz Ann Sonders
Standard & Poors
Stock Traders Almanac
Andrew Thrasher
Trader Feed
Valuation Stats
Vix and More
Ed Yardeni
Not everyone maintains a website, so two recommended Twitter Finance lists are here and here.