During my plastics and craniofacial training, I had a Canon IS S3. It took very nice pictures and had a flip screen for taking shots at weird angles. I agree with Max that the macro wasn't always as crisp as I would have liked.
I now have a Nikon D200 (they don't make them anymore so I got it new at a reasonable price) with a Nikor 24-85mm 1:28-4D with a macro switch. Since digital picture formats are slightly smaller than film (and the high end digitals) an 85mm is like having 127mm lens. If you don't understand this, then you need to read about it. Anyway, 100-105mm is great for portraits and the macro is great for close ups. I use this camera in the OR, in clinic, and when I travel.
They (Nikon) came out with the D90 right about 6 weeks after I bought my D200. If I had known about the D90, I would have gotten that one instead as it has live view and can shoot video. It's also smaller.
With all this being said, you really need to know something about cameras to get the best pictures. And I mean things like focal length, aperture settings, white balance, etc. Most of the SLRs will take good shots on auto, but you can do so much better when you understand the individual components. I know that the quality of my shots with my old Canon point/shoot went way up once I figured out which settings worked best in what environment.
To that end, I would recommend some books by Scott Kelby on how to shoot with a digital SLR (and it applies to P/S cameras as well). There is a web site by Ken Rockwell (
http://www.kenrockwell.com/) that has a lot of good stuff, although not everything he says is completely accurate . Finally, there are a couple of articles by plastic surgeons:
Digital photography for rhinoplasty
Plast Reconstr Surg 2002
Gregory M Galdino, Dennis DaSilva, Jack P Gunter
Standardizing digital photography: it's not all in the eye of the beholder
Plast Reconstr Surg 2001
G M Galdino, J E Vogel, C A Vander Kolk