Step 1: Install sshfs from MacPorts
sudo port install sshfs
Step 2: Create a mount point
sudo mkdir -p /media/mymount
sudo chown chris /media/mymount
sudo chmod 755 /media/mymount
Step 3: Create a script to mount the remote filesystem
#!/bin/sh
sshfs -o IdentityFile=~chris/.ssh/mykey.rsa \
chris@remotehost.com:/home/chris /media/mymount \
-o reconnect,transform_symlinks