I talked briefly about Causality and Necessity a while ago. That was in respect of the impact of Platonic and Neo-Platonic teachings on Islamic philosophy and mysticism. The following article by Phillip Sherrard looks at the same theory of emanation from a comparative approach which is very instructive for us as Muslims. It also tackles the problem of evil and though rather difficult in style is well worth reading in full. Part 1 is here and part 2 here.
I have taken this article from a new website of the traditonalist journal called Studies in Comparative Religion which contains a full archive of the journal dating back to 1963. Lots of interesting material.