Homejoy has been really flaky for me too. We've had problems with billing and inconsistent cleaning. I may try out Handybook now that Exec has folded into them.
One tiny bug: in the survey after the reading challenge, I was unable to change the number of hours I read per day. I tried to enter 1.5, but it won't take the decimal and I was unable to backspace to delete the 5.
Overall, a very cool idea, I was surprised to find that I read faster. It said only 3% faster, but I searched for an event mentioned in the first set of text which slowed me down.
Cool idea. FYI, when I expand the contest entry in the lower right corner and move the mouse out of the box, the text "Win a Free Month..." drops out of view and leaves an empty box with an email field & submit button.