IIRC (I only played around a bit with BeOS), the filesystem is journalled, which means that it's pretty resistant to power failures, crashes, etc. It also supports any number of attributes for each file (on the Amiga you could have the file comments in an attribute, the filename on another, the date on another, and even make up your own ones), and you can even search and sort files based on those attributes. Another cool thing is that the file type (yet another attribute) is based on mime types, so instead of using magic numbers or extensions, you assign a type to each file. For example instead of having a file called lake.gif or scanning it for "GIF89a" at the beginning, you query its type attribute and get "image/gif". Really neat stuff, and way ahead of anything anyone else has right now. Rumour has it that the filesystem in the next big Windows release (longhorn?) will use something like that.
