Here is another idea for a mobile app: translator.
In my last job, I had to travel abroad a lot for business. Luckily I was able to speak the local language, so it wasn’t a big deal to me, but some sort of translator would be cool. It doesn’t necessarily need Internet connection to work. Basic phrases could be downloaded with the app initially or downloaded before a trip. Since Wi-Fi (either open or paid) hotspots are available in many international cities, additional translation could be done easily. Ordering food or telling a cabbie where to go or asking for direction could be done so easily….. Perhaps, even local map, public transit map, points of interest with recommendations could be downloaded before so that the stay could be enjoyed better. Actually better yet, you use crowd wisdom to have other ex-pats recommend places to go, foods to eat, etc. Now it’s becoming more like a travel app with translator feature. And maybe work with local or international ad network to place small local-specific ads…..as revenue source.