1. A method comprising: registering a plurality of subscribers to a content delivery service; for each registered subscriber providing at a location associated therewith a subscriber system, each of the subscriber systems coupled to a Wide Area Network (WAN) and comprising at least one of a processing resource and a non-volatile storage resource; delivering content to a first subscriber system in accordance with the content delivery service, thereby consuming a portion of the at least one of the processing resource and the non-volatile storage resource of the first subscriber system; receiving a task that is other than in accordance with the content delivery service; providing the task to the first subscriber system, the first subscriber system having an available portion of the at least one of the processing resource and the non-volatile storage resource that is sufficient to execute the task; executing the task on the first subscriber system; and logging an activity record for the execution of the task based on an amount of the available portion of the at least one of the processing resource and the non-volatile storage resource consumed during execution of the task, wherein the content delivery service is provided by a content delivery service provider, and wherein a cloud-computing broker other than the content delivery service provider performs the following: receiving the task from a requestor; providing the task to the first subscriber system; and logging the activity record for the execution of the task based on the amount of the available portion of the at least one of the processing resource and the non-volatile storage resource consumed during execution of the task.