On Monarchy in Fantasy Fiction

Monarcy Marie Brennan took a look at the fantasy genre's enduring fascination with monarchy over at sfnovelists.com last week.

Marie made some very good points about just why it is that rule by kings, queens, princesses, princes et al seems to be such an ingrained trope of the genre (mythic resonance, focus of dramatic attention on key individuals) and there's nothing wrong with that sort of thing at all. But I also agree that it would be great to see some variety in the governmental power-structures from time to time.

Admittedly, we do see the occasional imperial (monarchic militocracy) or rule by a shadowy cabal of thieves and / or assassins (anarchic feudalism) or a council of wise mages (oligarchic noocracy) or knife-and-pyre-wielding high-priests (totalitarian theocracy) but there are other options out there that would be equally interesting to read about. Something based on the dynastic plutocracies that held sway in the mediaeval Italian City States, perhaps? Or how about a genuine meritocracy, in which the rulers are selected from amongst those best-suited for the job as a result of their skills and abilities (or would that be pushing the willing suspension of disbelief just a little too far?)

Of course, some of those systems (or others) may have been explored already and I just haven't come across them yet - any suggestions or recommendations for further reading?