This will provide the greatest relief against drive-by ssh probes, whichare pretty much background radiation these days. Some may decry it as 'security by obscurity', but who cares when it works so effectively :)
against script kiddies and bots, obscurity is good.
http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers provides areasonably useful list of ports NOT to choose for an obscure ssh port.
/etc/services is a good start too :) patpro
