I somehow lost my ssh key pub file, which is inconvenient when I want to copy it out to other hosts. I could grab it from another host's authorized_key file, but wouldn't it be easier just to recreate it? Here's how to do it.
[reamer77@myhost .ssh]$ ssh-keygen -y > id_rsa.pub
Enter file in which the key is (/home/reamer77/.ssh/id_rsa):
Viola. You should now have your pub file back without having to generate a new private and pub key file.