Jered Weaver has a career ERA of 1.37 in 26.333 IP and he just got sent down to the minors. Below are the top 10 in career ERA through 2005 with 26+ IP. Any pitchers below who are still active have seen their ERAs rise this year or they are still not as low as 1.37. Weaver is obviously in some fast company.

ERA                             ERA    
1    Harry Otis                 1.38  
2    John Weyhing               1.62  
3    Jerry Upp                  1.67  
4    Clay Hensley               1.70  
5    Huston Street              1.72  
6    Fernando Cabrera           1.75  
7    Myron Allen                1.77  
8    Brandon Medders            1.78  
9    Al Spalding                1.78  
10   Zach Duke                  1.81