Sounds like it is becoming a trend. So far we have:
Jeff Darcy explains why having a filesystem interface to NoSQL storage can make sense:
Voldemort is pretty easy to use, but providing a filesystem interface makes it possible for even “naive” programs that know nothing about Voldemort to access data stored there. It also provides things like directories, UNIX-style owners and groups, and byte-level access to arbitrarily large files. Lastly, it handles some common contention/consistency issues in what I hope is a useful way, instead of requiring the application to deal with those issues itself.