Having had a few hours to explore LR, Windows version I must say that I am delighted with the interface, the capabilities of the proposed product and the elegance of the proposed workflow.
That said, I must say that it is a pretty truncated program without some sort of serious editing tools. I can see being delighted with the straighforward Library, the great RAW developer, (being a RSPremium owner), and I am looking forward to the completed Print facility.
I think I will always want to make a round-trip out to PSCS2 and back again to print - I don't imagine that LR 1.0 will replace PS for the finer adjustments, or, for that matter, am I willing to dump Photokit Sharpener, and even their Color Pro or whatever the name of the thing is ...
I am looking forward to a fix for Ctrl + E to boot PS. Many of us have it greyed out.
Unless Adobe decides to split PS into a program for photographers and a program for graphic artists, I can't see how they can offer a full-fledged photo-retoucher and LR for any less than a full version of Photoshop.