If people announced that they had emailed you in this thread, would that be good or bad? I can see short arguments for both.
Good: Might encourage participation? Bad: Might bias results?
Overall, I would say bad. I don't think it would be a huge effect, though.
I am currently running a study on depression, in collaboration with Shannon Friedman (http://lesswrong.com/user/ShannonFriedman/overview/). If you are interested in participating, the study involves filling out a survey and will take a few minutes of your time (half an hour would be very generous), most likely once a week for four weeks. Send me an email at mdixo100@uottawa.ca, and I can give you more details.
Thank you!