Yelp may be the raconteur of restaurant recommendations and Foursquare the cardinal of check-ins, but Google has an ace up its sleeve: NFC chips. The company's embedded near-field communications chips into each and every one of these "Recommended on Google Places" window stickers, which you'll be able to trigger with a shiny new Nexus S -- just hold your handset up to the black dot, and voila, your phone gets a "tag." Google's now distributing the signs on a trial basis to Portland, Oregon businesses as part of a larger Google Places kit, though it doesn't explain how (or if) they'll be able to program the chips. Either way, if you own a hot new joint in Portland, you might as well give it a spin. Find the sign-up form at our more coverage link, or peep a Nexus S doing its thing after the break.