For each stock I will do a quick writeup from my research. Hopefully this will allow you to gain some insight into what I find attractive about this company.
Chesapeake Energy (CHK)
This is by far the single best performing stock in my personal portfolio. In a nutshell, Chesapeake Energy is involved in the exploration and acquisition of natural gas in the United States.
Management - Insider buying (Primarily Aubrey McClendon, other directors selling). As of July 31, 2008 he singlehandedly owns 33,452,911 shares.
One of the top "producers" of natural gas
Pays a dividend
I'm not a real expert here on Chesapeake's competitors, but these are what I found on Yahoo!
Anadarko Petroleum Corp. (APC)
BP plc (BP)
Volatile natural gas prices
Debt load (12B)
Financials (From Yahoo!)
Market Cap: 29.36B
Div (Yield): 0.30 (0.50%)
Disclosure: I own shares in Chesapeake Energy.