I thought this was very clever.
Originally designed for a dremel tool, this light ring could be adapted to any tool and really be useful. I don't know how many times shadows made my work slightly more difficult. The best part is how inexpensive the whole setup will cost. I would say this is a precursor, a harbinger of things to come. I predict that every power tool, soldering iron, or any hard tool will have something just like this in the near future. But if you can't wait until then, the creator of the device was kind enough to provide a PCB layout for the device.
Enjoy, and post a picture if you decide to build this light device.
Cabe