Apple, Cisco, and Dow 15000

The big point to know about the Dow is that it's basically arbitrary and not rigorous, but has a long history, so enh.

I personally watch NASDAQ Composite, S&P 500, and Vanguard VTI (http://www.google.com/finance?q=NYSEARCA%3AVTI) a lot more. If you just want to track large caps, Vanguard MGC. The Vanguard funds track MSCI indices and have super low expense ratios.