Professor Jack Balkin has written a very interesting piece on the possible effects of the Eldred decision on the DMCA. Professor Balkin goes as far to state that the DMCA is actually unconstitutional as a result of the Eldred decision. Balkin has an earlier piece on the Eldred decision here.
If you are an avid Lawmeme reader, then you should add Balkin's blog to your list of regularly read blogs.