Audio Walking Tours: P. T. Barnum's Manhattan, The Freedom Trails of Brooklyn, Hell’s Kitchen New York Times
Heres a set of podcast walking tours of New York.I have to say, I'm a bit excited, and wish I were soon to expect a few hours free time the the Apple. (And an iPod classic for Christmas). This was one of the earliest personal media uses I envisioned, and its really great to see some taking shape.

Theres also a print version article on Barnum, but you may remember the intriguing game we told you about a couple years ago.