The need to work over a network is critical. I know it has been raised before , both here and elsewhere. And the reason given by Jeff (please forgive me if this is incorrectly attributed) was that most photo studios are small/one man operations. This may be so, I am a prime example, I am a small studio working in Auckland, New Zealand, for local editorial and advertising clients. But even I have more than one Mac, and not just the desktop/laptop thing. I also have a partner who does most of the post production, but some times we both do, to meet deadlines. So currently Lightroom doesn't work for us. Don't get me wrong, I absolutely love Lightroom. But until the "library" can reside on a server, and be accessed by more than one operator at a time, perhaps along the lines of the "Version Cue" model used in Creative Suite, it will not be a major part of our workflow. Sorry guys.
PS: A little off topic, but relevant I thought, especially considering another of the busy threads today. A small point for the whole Photoshop/Lightroom/DNG team. With the issue of medium format digital backs and reliability, someone mentioned that when they bought their new back they kept their old one as backup. A very sensible idea I thought. Also for some types of work, older backs are still useful. I do a lot of editorial product work, where the 6mp files out of an old Leaf Cantare are perfect. If I sent them Valeo files for there 20 shot per page layouts, they would freak. Unfortunately I can't quite work with the MOS files from my six year old camera in any of the new Adobe programs. Apples latest update to the OS has just enabled it to generate thumbnails in the finder for the Valeo and newer backs, which has "accidently" enabled the older MOS files as well, but only in B&W. "Old soldiers never die" and all that. I still expect to be using the Cantare in another 10 years, the files don't appear to be that dis-similar to the newer generation. Please make DNG an option at the very least, so people can use their older cameras alongside newer ones in an integrated workflow.