I'm working on something similar at <a href="http://tripovore.com" rel="nofollow">http://tripovore.com</a><p>Basically I think city guides are obsolete (they have been there for 200 years with no major innovation) and have to be reinvented and trip planning automatized using APIs we have online. I currently use 6 of them: foursquare, songkick, instagram, google places, google translate and facebook.
I've been working on this for the past 8 months, but I'm having UX difficulties keeping such a complex problem as simple as possible. I first started this during the foursquare hackathon 2011 and the project won the grand prize (called my next trip at that time).<p>Would love to hear any feedbacks you got at feedback@tripovore.com<p>Thanks!