First, here's a link to the main opinion: http://wid.ap.org/scotus/pdf/04-480P.ZO.pdf. and here is Ginsburg's concurring and Breyer's concurring. I don't know about others, but I view the Court as having punted: they decided mainly an issue that wasn't in front of them (inducement) and didn't decide the one that was, the effect of Sony in the Internet era. I think this happened because neither the Ginsburg camp nor the Breyer camp could get two others to join. There were three for the picking, Souter, Scalia and Thomas. The two concurring camps have diametrically opposed views of the case, totalling six Justices. What does this do to the influence that the "unanimous" Souter opinion has? I think it greatly undermines it, resulting, as predicted in a muddied, murky future.
The Souter opinion does have a helpful slap down of the Ninth Circuit's bizarre "specific knowledge" requirement, and I think it is a good policy issue about the relationship of strong inducement evidence coupled with a staple article of commerce defense. But, I ask would the Betamax itself have met with Souter's approval? Recall Sony advertised that people could use it to copy their favorite movies, and we're talking here about librarying, not just time-shifting.
I need as most do, more time to sort through this, but my first read through is negative. We have two very different visions, Ginsburg's camp, which focuses more on what the hard evidence is now, and Breyer's, which focuses on the promise of technology, with three votes uncommitted to either camp. Regardless of whose side you favor, that kind of split is not helpful.