Since firmware 22.214.171.124 you can watch the stream of a webcam connected to the Fonera from the internet. It’s not that difficult to set:
1. Install the Webcam Plugin, and plug your webcam.
2. Enable WebGUI access from WAN in Settings >> Firewall >> Application.
3. Redirect the https port (443) to the WAN IP of your Fonera within your broadband router interface.
Check out this page of FON Wiki for more detailed instructions.