Configuration Merge for WCF
One of the blog's readers from Italy, Fabio Cozzolino has written a interesting host for WCF that gets and merges configuration from different configuration files. You can download the code from his post, which is completely in Italian. (Anyway, the code is not, it is English).
This could be a good solution to separate the configuration in logical partitions or divisions, and then, have a central host that consolidates all the configuration (It is a server side solution).