Business Source Complete: our best all-around business database, it has a bit of everything, including journal articles, company profiles, industry overviews, country reports, and more.

Business Source Complete Advanced Searching video Tutorial (3:14)

NAICS codes
"The North American Industry Classification System (NAICS) is the standard used by Federal statistical agencies in classifying business establishments for the purpose of collecting, analyzing, and publishing statistical data related to the U.S. business economy."

IBISWorld: comprehensive industry overviews, including:

• Investment Banking and Securities Dealing
• Securities Brokering

Other Business Resources:

• Mergent Online (formerly Hoover's) Current reports and historical data on US and international public companies. Profiles include a business summary, recent news, up to 15 years of financial data, institutional holdings, inside owners, subsidiaries, major competitors, and more.
• Hoovers… profiles of 18 million companies public and private worldwide.
• S&P NetAdvantage… info on stocks, bonds, mutual funds, industries.

Watch these short (& entertaining)  MarketPlace YouTube clips to review some basic terms and concepts:

Paddy Hirsch, senior editor @ MarketPlace explains....
    including:
Crisis explainer
Untangling credit default swaps
Getting naked in short selling
Uncle Ben goes shopping
Repo 105
Beware the carry trade!
Margin calls and the financial markets decline
Fannie, Freddie and the Fed
Subprime
Factoring
Why investors are suing the banks
Why 'Fallout' for the financial crisis?
Shadow banking: still big, still dangerous
Hostile takeovers
Currency pegs
How credit cards become asset-backed bonds
PIIGS
Counterparty risk
Market makers, stub quotes and new SEC rules
How the banks make the big bucks
Ratings conflict
Look out below!
Bonds, notes and bills
Wheres the toxic waste?
Dark pools
Quantitative Easing
and MANY more......