For me personally the best current solution that works is ClowdCrowd; they have repeatable tasks that pay a reasonable amount and they pay promptly, automatically, and without any minimum limit. Clickworker also seems to be gaining ground; like CloudCrowd they offer real, useful work projects but lose a few points with the monthly payment schedule and lower volumes of available work. These appear to be the only companies driving in the right direction: getting practical work and implementing large-scale projects that truly fit in with the concept of crowdsourcing, rather than one-off SEO type tasks. An honorable mention I will also give to Mechanical Turk, being the original means it still has some quality work available, but it is sadly let down by its limited payment options and a lack of will on Amazon's part to take it to the next level.