I recently found [http://www.people.fas.harvard.edu/~pnikolov/resources/writingtips.pdf Plamen Nikolov's Writing Tips For Economics Research Papers]. Plamen is a 2013/14 job market candidate from Harvard Econ, and I found his writing tips compelling reading, particularly for empirical work.
[http://blogs.ubc.ca/khead/research/research-advice/formula Jim Brander's Introduction Formula] is available from [http://blogs.ubc.ca/khead/ Keith Head's Blog], and is highly recommended for those writing papers in economics and/or business.