Well here are some of my views on the subject.
I like to talk about how data management for the average computer user is one of the most pressing areas to require innovation. This is due mainly to the escalating size and amount of data that a single user can accumulate and also the increasing size of Hard Drives. For instance, My "My Documents" directory here is 1.6G of document files. My offline cache of my company's documents, is around 6G. Managing this amount of data requires new systems past the rather tired Windows Explorer or similar.
What I find interesting, is that due to the popularity of Digital Media there are new ways of managing data that while aimed at Audio, Movies and Graphics are equally useful in managing more generic types of data. In particular, the ability to add arbitary Metadata (i.e. tagging!) with a database that is tracking individual files and so to allow searching, browsing and listing/sorting views based on that Metadata is extremely powerful.
This is of course what is commonly done these days by a number of Media Players. However J River, not only provide the best management system for media that there is (bar none); they have also seen the possibilities by extending the management functionalities to other files that are outside the range of the "ordinary" filetypes that can "played" or "displayed" internally to Media Center.
It's probably early days (well I hope so anyway) for this functionality, however even with the reasonably simple capabilities in the area that Media Center now provides - it still is doing some things that are more flexible and way more advanced than any other file management system I have seen.
The possibilities for the future are quite huge, so it will be interesting to watch the development further.
That's my 2c on the matter!