It was a piece of cake to install on my Linux box, and it looks like Mac’s have an implementation of FUSE available too. Once you have installed the tool you can mount a remote file system just like this:

format: sshfs username@host: folder_to_mount_in
example: sshfs dound@myhost.com: wwwdound

I now use sshfs to mount folders from a variety of remote machines on my local machine — it is much better-suited to many tasks than FTP, and for some tasks it beats SSH too. It is also handy when I want to grep remote files on a server I only have FTP access to. The only downside is that while you are in a terminal whose current working directory is within the remotely mounted directory all commands experience a slowdown – while I expected file-related commands like to run slower, I did not expect commands like clear to experience a noticeable latency. It is not clear to me whether this is an issue with sshfs, FUSE, or mounted file systems on Linux in general, but maybe I will look into it later. Regardless, I highly recommend sshfs — it is a very handy utility and much better than the alternatives.