This post http://www.cs.indiana.edu/classes/c661/sym-subsym.html gives some breif introduction and comparison of these two methods. It is pretty good.
Also I found this paper - Comparing connectionist and symbolic learning method which compares these two methods based on some experimental results. It is an old paper but I think maybe it is worth reading.
After searching on web, I found this book: Perspectives of Neural-Symbolic Integration(http://www.neural-symbolic.org/). Its name seems to imply that this book will introduction the combination of these two methods. I have not read it yet.
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