The Department of Justice has just published a paper I've written on the Spousal Support Advisory Guidelines. The paper is a rather technical look at the data required to run Advisory Guidelines calculations and the determination of income for spousal support purposes, and reviews the various tax deductions, benefits and credits allowed by the Advisory Guidelines.
I'm afraid that my paper isn't very accessible as it is was written for lawyers and judges who are already familiar with and use the Advisory Guidelines frequently, nevertheless it's publicly available for anyone interested in reading it.