Saw this via MedicalPocketPC.com. Very good review, nice breakdown of the functions. I agree with the above posters that 5MCC has been an 'essential' for med students and docs for a while. It's nice to see integration with Diagnosaurus too.
BTW several companies now publish this with slightly different interfaces.
This page shows all the different versions available - I believe that most have free trials so you can decide which one you like best.