If you are going away traveling (now that flights have resumed) you may find there lonely planet city guides for yout iphone or itouch extremelyt useful and best of all they are completely free until the 22nd of april. Just search for them in the App store.

Amsterdam
Barcelona
Berlin
Budapest
Copenhagen
Istanbul
London
Moscow
Munich
Paris
Rome
Stockholm
Vienna

http://inside-digital.blog.lonelyplanet.com%2F2010%2F04%2F19%2Flp-volcano-rescue%2F