[CentOS] OpenSSH multiple private key question

I am using CentOS 4.5 with OpenSSH_3.9p1 and I am curious if anyone  
has a solution for this scenario. I have several pub/priv keys that I  
use for various tasks/reasons. My issue is that I want to have 2  
private keys stored in ~/.ssh/ and I am not sure the best way to  
accomplish that. Currently I am using ssh-agent, and it works fine  
for manually performing tasks. I was curious if there is a simple way  
to have multiple private keys stored in the same ~/.ssh/ directory  
without using ssh-agent? Thanks for reading.

-Von