In its announcement of a podcast London tour, Antenna Audio also mentioned its plans for a similar treatment of Millennium Park. Sure enough, after a little rooting around online, I learned it's already available. Just enter an email address, and you're cooking with gas. There are 14 files of varying lengths, and, while the narration makes sure to mention the names of the corporate sponsors, it's actually quite informative and features interviews with Anish Kapoor, Frank Gehry and others. All in all, quite interesting listening, even if you're just sitting at your desk.