Since Apple recently agreed to let independent auditors into their suppliers' factories, Buzzfeed editor Matt Buchanan decided to ask some other tech companies if they'd do the same. He received no response from Sony but Microsoft was a bit more forthcoming, though they wouldn't be taking the same lengths that Apple would:
Microsoft currently works with the Fair Labor Association [ed note: this is the organization Apple is working with] on a project basis, including conducting worker surveys and factory specific capability building projects. As we presently have a robust auditing program in place, a deeper engagement with the organization has not been considered by Microsoft.
See the rest of the responses from Toshiba, HTC, and more here.