Managing SSH keys

I found a GREAT post on dealing with multiple SSH keys. This makes it much easier to securely use mulitple keys so a compromised systems doesn't compromise multiple servers.
In essence, you create a "config" file in .ssh and tell SSH what private key to use based on the name of the host you are SSHing to. You can also specify user and port. I also found you can specify multiple hosts as "Host abc or xyz"

~/.ssh/config

Host *.home.lan
  IdentityFile ~/.ssh/id_dsa.home
  User kbsingh

Host *.vpn
  IdentityFile ~/.ssh/id_rsa.work
  User karanbir
  Port 44787

Host *.d0.karan.org
  IdentityFile ~/.ssh/id_rsa.d0
  User admin
  Port 21871

I added aliases to my /etc/hosts file so I could differentiate between SSH running on mulitple ports at the same server (VM Server). Now I can SSH by the alias name from the hosts file and I don't have to specify the port number or user.