LH flight magazine this June ran a story on how they prepare for medical emergencies. Unfortunately, it does not seem to be available online. Two points of interest to me were that they have their own 24 h medical service available via sat phone, which they were looking to expand into in flight telemetry and video capability, and that they had had a doctor preregistration service in place since 2006. It allowed doctors to register and have advance briefing on the kit available in exchange for some frequent flyer card with special previleges, and the boon for the airline was that c/c would know in advance what kind of doctor was seated where.
There was also a recent article by LH doctors on in flight emergencies in a state physicians' association magazine, unfortunately only in German:
http://www.laekh.de/upload/Hess._Aer...2010_06_08.pdf