In terms of an actual style of beer, the Bamberger Rauchbier is your truest example. It's a lager made with malt that has been smoked over well-seasoned beech wood. In terms of what's happening today in the craft brew world, many different brewers are experimenting with smoke and smoke malt is available, also a lot of brewers smoke their own malt, and they'll usually use that in conjunction with something like a stout or a porter.
The Alaskan smoked porter is probably the most well-known example of this beer, it's delicious. Smoke, the smoke flavor can range anywhere from, you know, kind of just slightly smokey to, if it goes in a direction that many people feel is very wrong, to, you know, straight up ashtray. Sometimes you can get flavors of almost bacon or a campsite, and, as with anything, some people are really drawn to this flavoring or this style of beer and some people are absolutely not drawn to it. But, it is, it's a fun flavor that some brewers really enjoy playing around with.