It’s awesome when technology invades real life to make it better, like the way email makes letter-writing and photo-sharing easier. Louis Vuitton has manged to do that with a walking tour MP3 download that travelers to Hong Kong, Beijing or Shanghai can purchase for $17. Before gasping at the price, realize that New York tourists pay from $12 to $50 for the pleasures of a tour. The MP3 tours don’t require you to show up on time, and your guides are sexy-sounding Chinese actresses, rather than a bored NYU student. It’s pricey, but well done.