Just signed up and barely see any tasks. I think I'll stick with Bitcoinget. I know they pay at least.
If you know well about crowdflower, they don't just add all the tasks to new channels immediately. It takes them few weeks.
My tasks4dollars's crowdflower channel is new. So, expect few weeks to have all the tasks. But you can still use
www.dollarrewardz.com which is an old channel with all the tasks.