Not really new, but we only recently got around to it, and I don't know anyone else doing it over here. The Canadians have been doing it for about 100 years of BC and Vancouver Island, with Puget Sound joining in during the 1930's.
We've been taking our 7WT and 8WT fly rods out to troll for silvers. You don't have to get down far, and in fact the Canadians do a version with mono, and no fly line at all. They just let out 20'-30' of mono so the fly skims right along under the surface and sometimes skip on top at slow trolling speeds of around 2MPH. For obvious reason they call it "skipflying." Just about any sink-tip fly line ought to work just fine.
Anyhoo, we've been using sinking lines on our rods, but only letting out 20'-30' of line. The fly is running along no deeper than 1'-2' while trolling. It helps to pump your rod up and down a little to give the fly some action. Hang on tight, because they just about tear the rod out of your hand when they hit. If the fly is up near the top you'll get a boil, or if skipping along on top, a strike looks like someone tossed a downrigger ball into the water behind you.
We've been doing it for about a month now, refining our "chops" and testing a bunch of fly patterns. We've had a couple of skunk days when we couldn't find the fish. But when we find the fish, it's always hot action.
Today was fairly typical. We got on the fish right away and landed 4, lost 2 and missed a couple of hits. In half an hour! Best part was, when the first silver came up to the boat, there was a whole school swimming with it. No more trolling, just "cast" to the fish. More of a flop than a cast though, because we only needed about 10' of line out to connect.
Consistently best fly pattern for the last couple of weeks has been the Coronation Streamer. When they see it, they hit it. No questions asked.
Might as well put some serious fun into your silver fishing. Drag along a fly rod next time you go out and troll with that right close to the surface, and in the wake of the boat, back no more than about 30'.