My iPad was such an indispensable tool of my last three trips (Mid-East, China, Europe) that it has become THE constant source of Ready Information and Entertainment in other facets of my life. With so many great apps out there, I decided to concentrate on the 8 that are truly useful for the budget, foot travelling, wanna-experience-all-the-sights-and-sounds-in-limited-time traveller such as myself. 1.  Goodreader ($4.99) https://itunes.apple.com/en/app/goodreader-for-ipad/id363448914?mt=8 One of the best PDF readers for the Ipad, Goodreader not only allows you to read the PDF’s, it also allows you to highlight and add notes on the pages.  I loaded this app up with various DK Travel Series and DK Top 10 Travel List books (the best travel guides due to the abundance of pictures and maps) and was particularly helpful in Barcelona, Rome, Paris and London.