On the MacFUSE Project Page, you now have a new release of MacFUSE Core. Please be sure to upgrade as this fixes a nasty bug.
Besides, in the filesystems-objc subdirectory, you’ll find source for the Objective-C library that we used to create the file systems shown in the MacFUSE Tech Demos video.
You will also find the [...]

A new release is up at the MacFUSE project page.
0.2.0 adds several new features and fixes several bugs. New features include support for kqueue/kevent, advisory locking, full extended attributes support, support for extended security (ACLs), support for “direct I/O” (this allows the user-space file system to return less data than the file’s size, and MacFUSE [...]