Don't know how many have heard about Lumu Light Meter. This plugs into a smart-phone, either iPhone or Android, and has an app that comes up.
I found out about them through a kickstart program, and am very interested in getting one. They should be shipping this month. If they work as advertised, they'll be one of the least expensive light meters on the market!
Its a very unique product.
Check them out at >lu.mu<