Some tricks covered in the article include:

• using passwordless, key-based login;
• setting up local per-host configurations;
• exporting a local service through a firewall;
• accessing a remote service through a firewall;
• setting up a SOCKS proxy for Firefox;
• executing commands remotely from scripts;
• transfering files to/from remote machines;
• mounting a filesystem through SSH; and
• triggering admin scripts from a phone.