I’ve been using the bitvise Tunnelier for quite some time now in Windows XP and it is a real pleasure to use this easy tool.
For Mac OS X i couln’t find a tool like that until i came to the SSH Tunnel Manager . It is even easier to use than the windows tool and does a great job on tunneling your network traffic through firewalls. So you can have secure access to your non-ssl email accounts or just secure your traffic in a big company network. Ofcourse you still need some server outside your network with some ssh shell running.