mount_sshfs is a little wrapper around MacFUSE’s sshfs that is much nicer to use.
$ mount_sshfs
Usage: mount_sshfs [username@]address[:port] [directory]
$ mount_sshfs vemod.net
sshfs filesystem mounted successfully!
Volume name: vemod.net
$ mount_sshfs root@aerobox /etc
root@aerobox's password:
sshfs filesystem mounted successfully!
Volume name: root@aerobox-etc

Download mount_sshfs.rb, rename it if you like and put it somewhere in PATH.