Host Key Fingerprints

Where is the host key on a machine?: /etc/ssh/ssh_host_rsa_key.pub
How do you compute a fingerprint from a key?: ssh-keygen -lf /path/to/key
How do i find the host key for a remote machine i've logged into before?: fgrep name.of.host ~/.ssh/known_hosts (unless you have an hashed known_hosts)
How do i find the host key fingerprint for a remote machine i've logged into before?: ssh-keygen -lF name.of.host (this works even if you've hashed known_hosts)
How do i find the host key for a remote machine i haven't logged into before?: can't remember, but pretty sure there's a flag to ssh or something
What is urchin's host key fingerprint?: 1024 48:da:93:d7:df:ac:30:c9:96:73:a4:9b:4d:31:cb:7c (RSA)