Showtime is great program, but it only runs on Jailbreakable PS3 Consoles, so this is were the PS3 Media Server shines, it can run on your Windows, or Linux and even OSX box now, and it transcodes and streams all your media files to your PS3 which can be running any firmware, legit or custom! -- And now it been updated to v1.40 -- Still a BETA release so it might have some little bugs in it.
Changelog:

* Updated OS X MPlayer to enable external VOBsub, ***/SSA and Fribidi support
* Allow update checks to be performed manually (Windows only)
* Allow automatic update checks to be enabled (Windows only)
* Simplify PMS customization for packagers of custom builds
* Logging fix for headless configurations
* Added experimental support for iPad / iPhone
* Fixed DVD ISO playback on OS X (thanks, jjmojojjmojo!)
* Added support for the AirPlayer app
* Added support for Samsung TV model SEC_HHP_TV (thanks, coax-!)
* Added Aperture support on OS X (thanks, coax-!)
* Added thumbnail support for images (some code from http://www.rayinblu.com/ps3mediaserver)
* The cache is now reset after each up- or downgrade (for versions higher than 1.40.0)
* Files with the extension *.vdr are now being recognized as MPG videos
NEWS SOURCE: http://www.ps3mediaserver.org/forum/...hp?f=8&t=11898
DOWNLOAD :- Windows : Mac OSX : Linux