I hadn't noticed this thread till now, but I have a few comments based on observations from the last year+.
For admissions purposes, there is a difference between a low 700s score and a high 700s score. It varies by school of course, but I'd say once you get to about 750 or so, there are negligible benefits to having a higher GMAT score (for admissions). Higher is better, but you'd really have to be right on the borderline to notice a difference between 750 and something higher. I'd guess there are a handful of students per school per year who fall on this border. I do think it's absolutely false that all scores above 700 are equal (as someone suggested). Scores around 700 are average for most of the top schools and will more or less be a neutral application factor; a higher score could be a positive application factor.
For purposes of scholarships, I think the GMAT is a huge factor. I only have data for Darden (and not a complete set of data), but merit scholarship winners definitely have way above average GMAT scores. 750+ seems to be the sweet spot. If I recall correctly, all winners of the scholarship that I got had 760+ GMAT scores. Once they have made their admissions decisions, I think schools are clearly willing to shell out a few dollars to bring in some high scores. Of course, Harvard doesn't offer merit scholarships, but pretty much every other school will drop some coin for high scores.
For purposes of finding a job, well, my observations are incomplete at this point because I'm still in the middle of recruiting. There are a few things that are pretty clear though. At most top schools, about 1/3 of the class goes into consulting, 1/3 go into banking and 1/3 go into other stuff (general management, marketing and entrepreneurship largely make up this final 1/3). As others have discussed, consulting firms and investment banks will absolutely want to know your GMAT score.
Recruiters have just started to whittle down their lists here, and I have no doubt that GMAT score will be a pretty persuasive factor when they establish their closed interview lists. A 750+ GMAT doesn't mean you'll get on the closed interview list for a firm, but in my limited experience, it seems like it's a huge head start. The interview invite is pretty much yours to lose - just don't make an ass of yourself at recruiting events. I guess it's kind of like admissions in that way. The opposite is also true, of course. If you have a GMAT below 700, you will be fighting an uphill battle to get onto closed interview lists (I'm talking about banking, and I think consulting is the same). You're going to have to be a superstar schmoozer to overcome a sub 700 GMAT score for top IB and MC firms. At most schools, you might be able to bid for an interview even if you don't make the closed list, but I've been told by numerous banks that they don't seriously consider making offers to people that bid their way into interviews.
I understand that general management, marketing and other recruiters pay little attention to GMAT scores and grades, and interview mostly for fit. The recruiting dynamic seems to be very different for these types of positions; I get the sense that these companies are satisfied to know that you are at one of their target schools - you don't need to prove any more. IB & MC jobs are different though; competition for these jobs is higher (probably because they pay more) and you need to separate yourself from the crowd to succeed.