Well, I installed 3.0 on my Mac last night, and with only a minor glitch in it initially not being able to read the SD card on my PRS-505, everything seems to be working great. I was able to register the copy of eBook Library without problems, and smoothly transferred the some 150 books on my Reader with nary a hiccup. It's really terrific to finally be able to get all this working on my Mac, and to be able to manage my Reader natively in a Mac environment.
The UI appears to work more smoothly than the older PC version, and I actually like the book Viewer better than Calibre's viewer. The whole thing has more of an Adobe Digital Editions feel to it, and I wouldn't be surprised if the Adobe folks worked closely with Sony (who have never been good with software) to make 3.0 more polished and user-friendly. This is not to imply that Adobe's software is good by any means, but it is a more polished piece of primitive software than Sony's 2.x version.
Well, at least for Mac users I feel we are slowly moving out of the Early Stone Age of ebook culture, and (finally) entering a less primitive Late Stone Age. We still have a long ways to go to invent the wheel, but at least we now have fire. If only Apple would enter the fray, that would quickly get us over to a more civilized Neolithic era of ebook development!
Here's how it looks after transferring over my books:
