Sun Times – A few years ago, online gambling all but put bookies out of business. But today, in Chicago, bookies are embracing the technology that almost made them extinct. For example: BetChicago312.com is similar to mainstream gambling sites like Sportsbook or Bovada (formerly BoDog), except that placing a bet requires a password and having an existing member vouch for you. ‘‘It’s a tightly knit network with some professionals,’’ says John, an online gambler who asked to have his name withheld in fear of retaliation. John estimates that 600 to 1,000 members gamble through BetChicago312. And with the NFL season…