I'm working on a FUSE-based userspace filesystem for accessing Amazon S3 buckets: https://github.com/skoobe/riofs This is my hobby project, but recently it's got attention to several startups, so I hope I'll be able to spend more time to work on it.
Marbella, Spain is starting to get some attention from investors lately (http://marbellalabs.com). I really hope we will see more tech people here soon.
If anyone interested to see some real-world open-source FUSE example (but written in C), take a look at our project RioFS: (https://github.com/skoobe/riofs): an userspace filesystem for Amazon S3 buckets that runs on Linux and MacOSX (FreeBSD support is comming as well).