If you like to chat in forums anyway, then mylot is by far the best one for earning some spare change for doing something you like anyway.  The software rewards longer, more substantial responses and so you tend to get better conversations going.  It took me about 387 posts to earn $10 so really not a great way to earn a living but I had fun while I was at it.  You get points for rating other posts too which is really easy.  Once I reached payout, the money was deposited to my payroll account within a couple weeks.  This one's not a scam, just takes a few minutes of your spare time each day.