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Warren Buffet's Berkshire Hathaway is the most expensive stock in NYSE

From Yahoo answers
The NYSE requires a company to have been in business for so many years and have a market cap over a certain value, among other things.

The AMEX is less stringent on these values, and the NASDAQ even less so.

The buying and selling of Company Shares , also Bonds & many other financial instruments such as Futures

The New York Stock Exchanges provides an efficient method for buyers and sellers to trade shares of stock in companies registered for public trading. The exchange provides efficient price discovery via an auction environment designed to produce the fairest price for both parties.

From Yahoo Answers
The DOW is an index, which is a group of individual stocks, put into a group by the industry, and these stock make up the Index. The stocks in the index will have common characteristics. DOW is made up of large companies that are well established and most pay a dividend. It is a very old index.

The NYSE is the New York Stock Exchange. It is the old school exchange, very popular and a big name. Trades are done on paper, by people.

NASDAQ is the new school exchange, many tech companies trade here, and all trades are done electronically.

There are some trivial listing requirements differences, but they all have to have their SEC paperwork up to date. Most companies on either could qualify for the other, so it's really a choice for companies. Older companies tend to be listed on the NYSE because NASDAQ didn't exist when they were looking for an exchange listing and the NYSE makes it hard for companies to leave.

You can find it here on Yahoo Finance.

Not only Yesterdays Prices but Prices of any previous historical date.

Just enter your Ticker Symbol and Set the Date and click on Get Prices

The Nasdaq lists more companies and has a larger volume of trades. The companies on the NYSE are in aggregate worth more than the companies on the Nasdaq

The NYSE is a physical place where traders trade stocks. The NYSE uses Specialists to to maintain orderly trading in each stock. The NASDAQ is not a physical place, but an electronic system for trading stocks listed on that system. The NASDAQ uses market makers to make a market in NASDAQ stocks. Market makers trade for their own accounts

The New York Stock Exchange (NYSE) is a stock exchange based in New York City.
It is located at 11 Wall Street in New York City

Yes Stock Market is open on Columbus day.

Here is the NYSE Holiday Schedule

2008

New Year's Day
January 1
Martin Luther King, Jr. Day
January 21

Washington's Birthday/Presidents' Day*
February 18*

Good Friday
March 21

Memorial Day
May 26

Independence Day†
July 4†

Labor Day
September 1

Thanksgiving Day†
November 27†

Christmas†
December 25†

2009

New Year's Day
January 1
Martin Luther King, Jr. Day
January 19

Washington's Birthday/Presidents' Day*
February 16*

The New York Stock Exchange traces its origins to 1792, when 24 New York City stockbrokers and merchants signed the Buttonwood Agreement. This agreement set in motion the NYSE’s unwavering commitment to investors and issuers.
Now NYSE Euronext welcomes the historic American Stock Exchange into the world’s largest and most liquid exchange group.

Originally called the "curb market" because its brokers traded outdoors in the street, the Amex has been at the forefront of the U.S. financial markets over the course of two centuries.

From Wikipedia: