Alan Weiss, of whom I am a groupie, just published a quote that rocks my world. The full article is in the June 2012 issue of Balancing Act.
If someone pays you for your wisdom and advice, you’re a consultant—a “brain.” If someone pays you for your work and delivery, you’re a subcontractor—a pair of hands. Both constitute legitimate and respected work, but the former can charge based on value delivered and the latter can charge only on time spent on the job.
Consultant vs. contractor