Getting around port blockings at work

Here's a neat trick: I wanted to access my Mac at home from my Windows PC at work. I would use a VNC viewer (UltraVNC) to do it over an SSH tunnel, to encrypt it. However, work blocks port 22 - but not 5190 (instant messaging)! The built-in SSH server is fixed on port 22, though.

Normally you use port forwarding to route a port to the same port to a specific IP address. This time I set my Airport Express router to route port 5190 to 22.

Works like a charm.