Has anyone seen this new project? http://www.indiegogo.com/laser-spoke?c=home
The main benefit is that this is totally portable between bikes and wheels - if it works.
I was followed by them on Twitter today and took a look at the video. Seems an interesting idea but they are looking for £85k.
Also they say "affordable" but at a target price of £500 for the UK that still seems too much for a run of the mill cyclist like myself that would like to have power meter data but doesn't really need it that much. I can live with post ride data like Strava / Android for that sort of cost.