I have been doing surveys for years. I think I started when I was still in high school. It's something I can do a few minutes here and a few minutes there, and on my own time, and I actually make enough to cover most gifts for holidays and even put a little something into savings.
I get asked all the time what survey companies I use, so I thought I'd compile a list of the companies that I work with:
Global Test Market
Focus Forward Online
American Consumer Opinion Panel
Clear Voice Surveys
I also recommend YouData, where you get paid to view ads. They PayPal you payment every week!
Are there any that you have had good results with? I'd love to hear about them!