Leadership and management are two different skill sets - something a fair part of the business world doesn't get. They certainly impact one another, but they are distinct skills.
Put another way, the ability to effectively and efficiently marshal resources to accomplish an objective (managing) is not the same thing as - to borrow Steve's phrase - the ability to inspire others to "do more than they might otherwise" (leadership). Managers get things done, but people follow a leader.
Ideally a good leader should have decent management skills, and good managers should employ sound leadership principles, but far too often that isn't the case.
Just my $0.02 from over here in the cheap seats of the peanut gallery - please adjust for inflation and/or your local currency.