One thing I've noticed after I got interested in all things *nix is the different file formats out there. Before, I didn't really think about other formats than jpeg and png for images and mp3 for music, etc.

As an example, I've been programming using the farbfeld image format recently and using its associated tools for converting to other formats, such as pngs.

What's your opinion on new formats for media? Are they useful or do they divide media more and force developers to create tools for these new formats? What interesting media formats do you use?