3. Instapaper ($2.99): When I was back in LA and had an ongoing data connection with my Iphone, the idea of being "offline" was almost unimaginable. But when you're traveling to remote parks, beaches, etc..., internet access often doesn't exist, so access to your online data is unavailable. That is where Instapaper comes in, well, sort of. At it's most simplistic level, Instapaper is an app that enables you to save webpages for later offline reading across devices (computer, smartphone, etc...). It requires a bit of pre-planning, but it can be very useful. I would often save articles of interest to me through my computer or the instapaper app and then later read them on my iphone when on a bus, in a park, etc... where internet access didn't exist. Quite often, this app served as the catalyst for my trip planning - rather than lugging around travel guide books (i.e. lonely planets) that take up space, I'd often visit a couple online resources (wikitravel, travel independent, lonely planet, etc...) and simply save extensive city summaries and read them on airplanes/trains/buses to put together my upcoming itinerary.