Leonard Riskin, a professor at the University of Florida Levin College of Law, teaches mindfulness meditation to law students, lawyers, and others who face stressful situations. He says that mindfulness meditation helps one to be a better lawyer. Meditation Geek has posted several videos of him at that link.
I've found meditation to be invaluable in my practice as an attorney. I use it both as a coping mechanism for stress and in focusing my mind to work in that particular lawyerly way. As the caseload in my legal practice has steadily increased, I've also increased my meditation practice.