Honeygain is a service that will pay you for your excess bandwidth. You just install it on your computers or mobile devices and it will detect when the system is idle. From there it will utilize your extra bandwidth and reward you based on what it uses. After a week of running it, here is my following output and the amount I have earned.

1/28 - 2.75GB

1/29 - 948.6MB

1/30 - 1.07GB

1/31 - 1.05GB

2/1 - 1.02GB

2/2 - 1.13GB

2/3 - 1.34GB (not a full day)

Total value of the data is : $1.05

I will say this was on a test laptop with a weak wifi attached to a 3MB DSL connection. I plan on getting another test off of a different connection using an ATT hotspot averaging 30MB speeds at the end of this week.