With the latest update we now have a solution for that. You simply set a mark on the "system" tab of your Meteobridge, that you want to have it accessed from the Internet and store the associated Link somewhere to make use of it when you are outside of your LAN's reach. It hardly can be any more simple.

For the tech guys... When told so the Meteobridge opens a SSH tunnel to a gateway server in the Internet. When you connect to your Meteobridge with the given link, you reach out via HTTPS to this gateway server which redirects the traffic to the SSH tunnel your Meteobridge has established. Traffic between your browser and the gateway server is SSL encoded and traffic through the SSH tunnel from the gateway server to your Meteobridge is also encrypted by SHH services. Gateway server is managed by smartbedded UG, who also does the Meteobridge development. When you unmark the switch in your Meteobridge, no SSH tunnel is established. To make use of the tunnel you still need your individual Meteobridge HTTP password. The URL to the gateway server is individual for each Meteobridge and looks like this (non-working example just for illustration):
https://admin.meteobridge.com/b90e0dd13 ... d4afea0a8/
The previous option to give smartbedded UG exclusive access has been dropped in favor to this more generic solution. I think this brings remote accessibility to a new level of simplicity for the Meteobridge user base.
Please see details in the updated wiki: http://www.meteobridge.com/wiki/index.php/System