I've been looking into inorganic polymers a little and intend to write about them for my Polymer Physics final paper. They turn out to be rather interesting and have all sort of interesting backbones like silicon, germanium, tin (a metal), phosphorous-nitrogen, and others.
The Si and Sn backboned polymers are the most interesting to me, having interesting conductive and physical properties. As an example, polydimethylsilane (silicon backone with two methyl groups off each silicon) is a crystalline polymer that is insoluble in everything and does not melt (but does decompose at 250°C). All in all, very curious materials that I will be looking into.