Meerkat | Code Sorcery Workshop: "An easy-to-use SSH tunnel manager built specifically for the Mac.
A perfect marriage of UNIX power with Mac elegance, Meerkat includes innovative features such as application triggers, automatic reconnection on system sleep & network change, Growl integration, Bonjour support, command-line and AppleScript integration, and much more.
Not familiar with tunnels? SSH tunnels (sometimes called port forwarding) are a way to use an SSH account on a server to forward other types of net traffic -- for example, HTTP web traffic, iTunes music sharing traffic, or SMTP email sending traffic -- through the SSH account. Then, this traffic appears to come from the SSH host instead of the original computer."