I live in Chicago and just recently attended the Wired NextFest, where there was a demo for a "Power Assist Suite" (see a picture here: http://www.vcl.uh.edu/~pavlidis/nextfest/photos/Fi gure%2017.JPG). It was cool in concept, but I was rather let down having seen the thing in action; it was extremely cumbersome and took a good ten minutes to prepare.

The device here looks much more appropriate, while having many of the same features as the one presented at NextFest.