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Amazon's DRM is currently based on an eight character PID. It sounds like it might be possible to use GPUs to brute force that in a reasonable time.
But all this discussion of brute force cracking of DRMed content is pointless. It's never needed. Anyone buying a DRMed ebook (or other media) already has access to the password — whether it's a B&N Name & number password, an Amazon PID or an Adobert Adept key.
None of the current DRM removal tools require a brute force method to find the secret key. It's already known.
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