I would like to add a few thoughts.
I agree with jjj, as a DAM solution, Lightroom is flawed, because of its limited focus, no pun intended.
In the real world, photographers work with all sorts of files, which is why a lot of people still use Bridge, or something else. If you are going to have a DAM solution, it really has to cover everything that your business might deal with, and that includes, for example the rest of the CS suite, which brings up the issue of CMYK. I am a commercial photographer, almost everything I shoot ends up on a press, and where possible I supply CMYK (anyone who doesn't, and then complains about the prepress guy stuffing their shots, gets what they deserve, sorry to be harsh. :-) ) so Lightroom is a no go. I also am only a small studio, but I have an assistant, the fact that only one machine can access the database at one time is a killer, I have discussed the issue of multi user network access with Adobe, ala Bridge and Version Cue, and got the impression that it could be done, but they don't really want to, because it would be hard. :-(
Oh yeah, soft-proofing would be nice too. Ha ha.