On Austin City Limits, the Fleet Foxes had what looked like an electric Hagstrom 12 string guitar. But then they showed a close up of it and it had some sort of dulcimer spring leaf hammers on the bridge. That must sound so cool!
Here’s some great info about the Hagstrom F-12S (and H-12 in Europe).
And here‘s some video of someone with the dulcimer hammers installed on one of these guitars! Sorry, you have to click on the link since I can’t figure out how to embed yfrog video clips. But here is video of it being used in Seattle by Fleet Foxes. Watch the bottom left corner of the screen for it.