I have had some luck with these.  I stumbled upon a group on the Internet called: http://www.greatopinions.com.  I signed up and immediately started getting calls for legitimate offline/online focus groups that you participate in for decent cash.  The last one was at a hotel in my town put on by a popular radio station.  It was 3 hours and the reward was $70 in cash at the end.  No questions asked, and no commitments.  I thought it was a great opportunity.  It was fun, the provided snacks and coffee. 

I found the people that work for Great Opinions are nice people and very accommodating.  I would call them to remind them to contact me for any upcoming groups. 

 Go to the site and check it out.  They even had online focus groups that are fun too.

Regards,

Pegasys