Helpers

The Stock Linker

Brokers

Interactive Brokers
Oanda (forex)
Open E-Cry
optionsxpress
thinkorswim (options)
TradeStation Securities

Charting/Software

Amibroker
Barchart.com
Ensign
eSignal
Neoticker
Prophet.net
Quotes Plus
QuoteTracker
StockCharts
TradeStation
Telechart
TFC Commodity Charts

Discussion Boards

EliteTrader
MoneyTec (forex)

Exchanges

American Stock Exchange (AMEX)
Boston Options Exchange (BOX)
Chicago Board of Trade (CBOT)
Chicago Board Options Exchange (CBOE)
Chicago Mercantile Exchange (CME)
EUREX
Euronext
Frankfurt Stock Exchange
Hong Kong Futures Exchange
ISE (options)
London Stock Exchange
Montreal Exchange
NASDAQ
New York Board of Trade (NYBOT)
New York Mercantile Exchange (NYMEX)
New York Stock Exchange (NYSE)
One Chicago (single-stock futures)
Osaka Securities Exchange
Paciific Exhange - now NYSE Arca
Philadelphia Exchange (PHLX)
Sydney Futures Exchange
Tokyo Stock Exchange
Toronto Stock Exchange

Regulation

Commodity Futures Trading Commission
National Association of Securities Dealers
National Futures Association
Securities and Exchange Commission