This program is really good. 
Tab completion, extended keyboard features like up / down, it’ll generate an RSA key for you, just generally very nice.
I don’t support password login to my main server, so I just SSH’d into my OS X box at home, generated the paired key and transferred it, and then added the line to my authorized_keys file up on the main server I wanted to pair the iPhone with. (This way I can just kill that line if I ever lose my phone or something.)
