Not sure about the "take a picture of your boarding pass" bit, I think a better way would be "email go@goingtobe.in with the city and country in the subject lin

Not sure about the "take a picture of your boarding pass" bit, I think a better way would be "email go@goingtobe.in with the city and country in the subject line, and you'll be emailed info about that place", similar to how Posterous does their email-based submission/response method (which I think is awesome personally). Nearly everyone has email with them at all times, whether it's their phone/tablet/laptop/etc, so it saves you having to worry about an app or cross-platform website. Your email response could contain a basic teaser/intro to the place, then prompt them to click through to see the details information (which also lends itself nicely to a freemium model, the basic 1-2 line summary is free, clicking through requires an account). The body portion of the email they send could contain flight numbers or other optional details to help narrow down the time to send them the info, etc.