I'd like to get into doing some remote lighting, but really don't get the best way to do it.
I've got a Nikon D3100, so no "commander mode" with the built-in flash. My current external flash is a SB-600.
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You've got a few options:
I've had good, reliable luck with the cheap Cowboy Strobist radio triggers and think they're a great way to get started.
While I'm not sure of the state of Nikon and remote flash support on the D3100 (though, for some reason, I think it does support it), there are a large variety of radio triggers available on the market ranging from the inexpensive Cactus V4 which work decently (I've used them with studio strobes) to the more expensive RadioPoppers and a whole host in between, some of which will support Nikon TTL for flash.
In any case, as you get into remote/strobist lighting, you'll probably want to move to radio triggers anyways, regardless of your camera support for wireless. The camera options are optical, so suffer from line of sight, distance, etc. Radio is the way to go if you really want control over position and distance.