What's in the Dow Jones Industrial Average?

Have you ever wondered what this Dow Jones thing is?  Here's a list of companies in the Dow, with links to their stock price page and websites, courtesy of  The Investment FAQ:

MMM	3M Corporation
AA	Alcoa
MO	Altria (was Philip Morris)
AXP	American Express
AIG	American Int'l Group
SBC	AT&T Inc. (was SBC)
BA	Boeing
CAT	Caterpillar
C	CitiGroup
KO	Coca Cola
DD	E.I. DuPont de Nemours
XOM	Exxon Mobil
GE	General Electric
GM	General Motors
HPQ	Hewlett-Packard
HD	Home Depot
HON	Honeywell
INTC	Intel Corp.
IBM	International Business Machines
JNJ	Johnson & Johnson
JPM	JP Morgan Chase
MCD	McDonalds
MRK	Merck
MSFT	Microsoft
PFE	Pfizer
PG	Procter and Gamble
UTX	United Technologies
VZ	Verizon Communications
WMT	Wal-Mart Stores
DIS	Walt Disney Co