Tunnelling SSH sessions through HTTPS proxies
proxytunnel is a piece of software that allows the tunneling of SSH sessions through HTTPS proxies.
The current version has been written for (and was tested on) Linux, but I bet it is pretty portable... There are CygWin and OS X packages too (on the SourceForge site).
For more information, read the README file or the excellent article (uh, uh :-) here.
The latest and greatest can be found at SourceForge.
Here, you can download: