65. The non-transitory computer-readable medium of claim 51 wherein the associated compensation for each of the at least some available tasks is a monetary payment.
51. A non-transitory computer-readable medium whose stored contents configure a computing device to perform a method, the method comprising: receiving information at an electronic marketplace from multiple executing programs of multiple task requesters that indicates multiple tasks available to be performed by multiple human task performers who have registered with the electronic marketplace as being able to perform tasks, the information being received via a programmatic interface of the electronic marketplace and indicating multiple available tasks that each has one or more associated required qualifications for a human performer of the task and has associated compensation for performance of the task, the electronic marketplace being provided by one or more configured computing systems to facilitate task performance transactions involving the task requesters and the human task performers; for each of at least some of the available tasks, identifying one or more human task performers who have indicated to the electronic marketplace to be available to perform tasks and are otherwise unaffiliated with the electronic marketplace and who each have one or more qualifications that satisfy the required qualifications for the task, and providing information about the task to the identified one or more human task performers to enable each of the identified one or more human task performers to select whether to participate in a transaction that involves the identified human task performer performing the task for a task requester in exchange for the associated compensation for the task, the identifying of the one or more human task performers for each of the at least some available tasks being performed by the one or more configured computing systems; and for each of one or more of the at least some available tasks, after receiving results for the available task based on performance of the task by one or more of the identified human task performers for the task, and without further human intervention, supplying the received results via the programmatic interface to an executing program of the task requester from whose program the information about the task was received, and facilitating providing of the associated compensation for the task to those one or more human task performers on behalf of that task requester.