textchat121 is decent. They are friendly and help you along the way and they pay once a month and on time. The only thing is the pay is not so great, it was .10 a text when I worked for them. You can do a couple hundred in just a few hours if you work the right hours a day.
if you do 100 texts an hour (and you have to type real fast to do this, as they have a minimum for how short each text can be, you cant do any single word or "smiley" texts or "lol") you would make $10. How ever...I find that it's just about impossible, you might get 40-50 in an hour on a busy time. And I am one of the fastest typers I know.
Still, good supplemental income!