What is the best travelling iPhone application for a 9 day trip through Europe?
My answer to What is the best travelling iPhone application for a 9 day trip through Europe? on Quora
Instapaper is essential—it will let you save any web page for offline access on your iPhone which is fantastic things like Wikipedia and Wikitravel.
OffMaps is another excellent offline tool that lets you save maps from OpenStreetMap, which has excellent coverage around Europe.