Zenohack.com Ninja Guide

Resources for Trip Planning

US Department of State's travel site Info on foreign-entry requirements, travel warnings, and more
TripAdvisor and Booking.com Traveler reviews, and hotel prices and availability
Via Michelin Maps and route planner
Deutsche Bahn Train schedules for anywhere in Europe (see my tips for using it)
Rome2Rio Compiles different transportation options from one destination to another
Weather Planner Weather-prediction site that uses historical data
This here site! Lots of destination-specific trip-planning advice to get you started, a vigorous travel forum, festival and holiday dates, and a trove of Rick's TV shows, radio interviews, articles, and travel-skills talks
TripIt All-in one travel organizer