You won't make a lot of money with Enrollapp but what I really love about them is that they will send you a test and you usually only answer one or two questions and that's it. They pay about $0.10 per test and you have to have at least $1.00 in your account to get paid. Usually they send me a test where all I have to do is pick which version of a website I like the best. Pretty easy stuff.
Like I said, you won't get rich but it's not bad for pocket change. =)
If you're interested in signing up just go to EnrollApp.com.
Have you used enrollapp? What do you think of it?