I am participating in online surveys at OpinionBar.com. Once in a while I receive an emailed invitation to give my opinion on websites, commercials, services and products so they can be improved and become more user-friendly.
For each survey in which you participate you will receive a financial reward. Once you have reached the threshold, you can redeem your rewards by having them transferred to your bank account or you can donate them to a charity.
If you are interested in joining comment on this post with your email address, the only way I can invite you is through an email invitation.