Stock Screener
Find the best stocks by screening companies according financial criteria.
www.google.com

Get information on companies
Hoovers has detail information on companies with some information free and more detailed information for a fee.
www.hoovers.com

I Shares
Own a basket of stocks in a tax efficient and flexible method.
www.us.ishares.com

Stock Sector List
A complete list of sectors for stocks.
www.biz.yahoo.com/

Stock Options
A site for information and trading options
www.optionmonster.com

Stock Financial Statements
A site that shows financial statements in both a graphical and report method.
www..morningstar.com