Betting on beaming: Palm hopes infrared stations expand audience for PDAs. I saw these, installed but nonfunctional, at busstop shelters on a trip to NYC last month and thought they were a fantastic idea for those of us who haven’t gone wireless — to download area streetmaps, guides to eateries, local attractions, etc. They’d be very useful at conferences. Now, how to filter out the inevitable ads and other lame non-content they’re likely to send my way. SF Chronicle