Is FICO the only game in town?

No. There are two main scoring systems: FICO (Fair Isaac Corp.) and VantageScore.

1.    A FICO score ranges from around 300 to 850. 
Typically, anything higher than around 760 is considered a good credit risk. The average FICO credit score is about 693 (according to http://www.experian.com in early 2010). 

2.    A VantageScore ranges from 501 to 990. 
It’s based on standard grades A to F (A = 901 to 990,  B = 801 to 900, 
C = 701 to 800,  D = 601 to 700, and  E = 501 to 600).
 
Be careful—the same score from the two systems may mean different things. For example, a score of 760 from FICO means you’re an excellent credit risk, but the same score from VantageScore gives you a grade of "C." So make sure you know which score (FICO or VantageScore) you’re viewing.