SSHMeIn is a totally Ajaxed and open source web application that helps managing remote Unix servers behind firewalls.
Once a SSH tunnel is opened within the server, the application can control it easily.
If you are managing multiple servers, they can be organized in groups for easier access.
It has an increased security via unique keys for each computer, date-time of the last verification can be viewed.
There is also a web service which allows indication to a remote computer to open the configured tunnel according to the parameters provided.
Simply, SSHMeIn is a very handy application if you have your own .nix servers.