If you prefer to do your snooping indoors, this wi-fi cafe, with its technophile clientele and tasty macchiatos, is the perfect place to eavesdrop — electronically, visually, and aurally. Because Nomad’s wireless Internet service is free and the coffee and snacks are tasty, Nomadiacs tend to be all-day e-communicators. At any hour its tables are occupied by folks who spew their most intimate thoughts into cell phones, compose self-indulgent oeuvres quite visibly on their laptops, or e-mail private and sublimely entertaining messages, all of which are easily accessible for your amusement — hey, wi-fi ain’t exactly private, you might recall. Whether you practice the receptive art of quiet attention or are more the hacker type, this is a target-rich environment for studying the young cyberian in his or her native habitat. And if all the systems crash, there are the occasional flesh-and-blood types having face-to-face conversations that you can listen in on as well.