I'm currently working remotely as a developer in Costa Rica. I have ADSL as my primary internet connection and also share my landlord's wifi (a radio broadband connection) as a backup. My DSL connection goes down for brief periods several times in a day. The backup connection also goes down regularly for short periods. I am in good 3G territory and am considering purchasing a USB 3G card as a third fallback option.
My largest concern is that the connection will go down during Skype conferences with my clients (which has been happening regularly).
Is there any way that I could configure the three connections to seamlessly support each other in case one or two are interrupted during a Skype call, without dropping the call? My primary connection is ethernet, secondary is wifi, and third will be via the usb 3G card. I am running Windows 7.