Carbon (Beta) is an enterprise productivity application, inspired by successful interactive games. It creates an economic system with its own currency and market that allows users to better manage their attention and that of others.Sounds like the model is "Read this email and I'll slip you a fiver".
I'd want to see an on-screen meter showing my 'vacation day status' - this changing daily as I go about my business. Have a productive day, get an hour of vacation added. Spend the morning blogging, lose 30 minutes.
How would I fill up my health (benefits)?