Always a touristy giveaway is the bulky tour book. Leave it at home and instead bring your cell phone. Now available are cell phone city tour guides, downloadable mp3 guides and iPhone application guides.

Tried and True – Seeing Central Park, Audio Guide 646-862-0997
Visit website to download map. Look for little green signs near your favorite landscape. Call the number above, then the extension on the sign followed by the # sign.

We tried this audio guide tour at Central Park today and loved it. 40 different celebrities such as Anne Hathaway, Sarah Jessica Parker, and Whoopi Goldberg are the voice guides who present short histories of park landscapes. We would definitely recommend.

Several Cities & Museums have cell phone audio tours including:
Pittsburg Cultural District, Pittsburg, PA – 412-235-6276
Getty Museum, Los Angeles, CA – 310-499-9236
Smithsonian Air & Space Museum, Washington D.C. – 202-747-3405
New York Botanical Gardens – 718-362-9561

For a more complete list check out guidebycell.com

iPod/MP3 city guides
iAudioGuide.com – 40 cities in US & Rome
Strollon.co.uk – Prague, Czech Republic for free with several other pay for guides
ItalyGuides.it- Rome, Italy

Free iPhone city guide applications
HearPlanet – Global Guided Tours Coverage
This cool application plays audio tracks of Wikipedia articles based on points of interest surrounding your current location, turning your iPhone or iPod touch into an audio tour guide.

Go Tour It – San Francisco & Houston free with 29 pay-for-guides
Self-guided GPS tours on your iPhone.

Blue Walks – World wide walks
bluewalks lets you create your own walking tour, or find the walk tours of your taste from the bluewalks community