Philosophical Methodology

This piece, by Timothy Williamson, is the best paper I know of on the topic of philosophical methodology:

http://www.philosophy.ox.ac.uk/faculty/members/docs/Must%20Do%20Better.pdf

As Williamson wisely points out, "Rigour and Depth both matter: but while the conscious and deliberate pursuit of rigour is a good way of achieving it, the conscious and deliberate pursuit of depth (as of happiness) is far more likely to be self-defeating."