I work with Focus Pointe and American Consumer Opinion.
Like Flash said, they don't pay as much as they used to, but it's cash.
I fill 'em out year round and cash them in for Xmas shopping. Just emptied both accounts and got enough to buy my GF some of those @#$%& we are being spammed with today.
Sometimes it seems like a lot of work for $1 or $2, but I do them over morning coffee and it ads up over time.