FUSE on the Mac
Using FUSE modules, you can mount all sorts of innovative resources -- Gmail, your Flickr photos, a remote SSH server -- directly into your local machine's filesystem and use their contents exactly as if they were normal files. Now you can do the same thing on Mac OS X, courtesy of MacFUSE.
FUSE has never been limited to Linux, of course -- FreeBSD has had it for years. And it is OS X's BSD compatibility that enabled Google engineer Amit Singh to write the FUSE kernel extension and library he released in January.
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