This one is for the real Mac geeks out there. Amit Singh, author or Mac OS X Internals: A Systems Approach, is widely recognized as an über Mac-geek and possibly the person outside of Apple that knows the most about Mac OS X. He is now employed by Google as their Mac Engineering Manager. As he just announced on the Official Google Mac Blog, he used part of his "20 percent time" to implement the "FUSE (File System in User Space) mechanism" for OS X (it was originally developed for Linux). He explains, "FUSE makes it possible to implement a very functional file system in a normal program rather than requiring a complex addition to the operating system." He links to the FUSE project wiki listing of applications. While this won't have an immediate impact on most of us users, it has a lot of potential. As pointed out on MacSlash this may eventually bring full read/write support for Windows NTFS formatted disks to OS X (Mac OS X can read, but not write to, NTFS disks) or even "filesystems which run over ssh and gmail."
[Via the Official Google Mac Blog]