Is it possible to have more than one private/public key pair per user for SSH?

You can have multiple SSH keys (multiple identities). To use the at the command line add a -i option, e.g.

ssh -i .ssh/id_dsa_host_1 host_1

If you have a key for each server you can add the info in the .ssh/config file (see man ssh_config for details), e.g.

Host host_1
IdentityFile ~/.ssh/id_dsa_host_1

Host host_2
IdentityFile ~/.ssh/id_dsa_host_2

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