A. Interesting idea but how would you make money? Advertising inside an app that carries advertising itself doesn't sound viable. If you charge for subscriptions how do you compete when Skype comes bundled into Windows?

B. I've looked hard at that space. Software isn't going to suddenly make managers become telecommuting friendly. I thought the market would eventually make it happen but that doesn't seem to be the case. There's a pretty large differential in coders wages between the Valley and the Midwest but you don't see companies embracing telecommuting in large numbers.

C. This is the best idea in my opinion. There are multiple revenue options but you've got answer how you will distribute it? I would also consider seriously marketing to the school at home market. It's a sizeable niche that you could target inexpensively and once you're successful you can build out from that beachhead.