As a sysadmin that often gets the privilege of pretending to design the smallest of complex systems, one of my regular components has been CouchDB because of its built in http api.
I've never been anti-Mongo, but this one little piece has made CouchDB an affordable choice for people like me who are not equipped to otherwise defend the choice.
Is there a missing piece that could deal Mongo back in the next time I try to convince someone that there's as straight a path to the sysadmin solutions I generally compose?