[tremt]

Ever heard of the story of how much would you charge to wash all windows on Seattle?

Cool response nowadays: Nothing! We will get investment, do it for free and figure out later how to make money :)

http://fseek.me/2010/12/how-much-should-you-charge-to-wash-a...

[nostrademons]

You could even make it ad-supported. The glass facades of office buildings would be prime billboard real estate.

(ETA: I came up with that before reading the linked article, I swear!)