Topic of the Day:
Doogie Howser, M.D.
E/R...not to be confused with
ER, although both starred George Clooney.

Emergency!
Grey's Anatomy (which just recently became the longest running scripted medical program in US TV history)
M*A*S*H
Marcus Welby, M.D.
Private Practice (a Grey's Anatomy spin-off)
Royal Pains
Scrubs
Trapper John, M.D. (that's where I first heard of Brian Stokes Mitchell)