I found a couple of real medical apps for pros (reference, calcs):
Pocket Lab Values: Apparently it's an established app on other platforms. $2.99 with no trial, but seems to be a good one. Just bought it, too; it has plenty info, is fast, search works perfectly, though I'm not sure if it's really worth 3 bucks. I bought it to support the devs that do come over to WP7.
http://www.windowsphone.com/en-US/apps/4af64c71-5a68-4578-b0f6-220d580750db
MPR: Monthly Prescribing Reference. This one has some more time, a month, I think. Just found it today. Seems to have a lot of info, though not as complete as others according to reviews. Gets content updates apart from actual app updates. Fast and fluid Metro.
http://www.windowsphone.com/en-US/apps/19f1469f-5920-4231-9e81-3daaaae947dd
Medical Mnemonics: I bought this one myself. Has over a thousand ways to remember useful stuff that we're required to know in Med School. Laggy, but really useful. Info is worth well over $1.99
http://www.windowsphone.com/en-US/apps/a02171f1-bdf5-df11-9264-00237de2db9e