I'm a member of a few online survey panels. I've been getting out of them generally, since the compensation is usually not really worth the time, but I'm staying with Pinecone Research because they pay $5 cash for most surveys. Pinecone is an invitation-only panel; they generally don't accept applications from folks who don't come in through a specifically placed advertisement.

However, they've sent out email asking for referrals of "male consumers 18 years of age or older".

If you meet those criteria and are interested, drop me a comment here and I'll forward the invitation email. (Rather, I'll forward it to anyone on my Friends list and will consider forwarding it to other respondents.) There is no guarantee that they will take a given applicant, but I will mention that I've never had any privacy concerns about them.