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To quote from his page linked above: After about a month of hacking I'm happy to announce that Showtime now can be run as a native "homebrew" application on the PS3. See PS3 usage guide for more information of how to get started.
If you have any questions please use the http://www.lonelycoder.com/redmine/projects/showtime/boards/15 on this site.
For a full featureset of Showtime see http://www.lonelycoder.com/showtime
Most of this should work except for playback of high res. HD videos (basically when the PPU runs out of cycles). There are a bunch of strategies for how this should be handled but I've not had time to start digging into this yet
Showtime on PS3 has been tested with 576i, 720p and 1080i video resolutions.
I've tried to set reasonable defaults for overscan compensation. But if it not correct for you it can be adjusted under Settings -> Display and UI settings
Buttons on controller
✕ Activate (Enter) currently focused item
○ Navigate back
△ Bring up options / playcontrol menu
□ Screensaver (Until something better has been figured out)
▬ Home menu
L3 - Bring up playback info (During video playback)
R3 - Bring up log console
Plugging in a standard keyboard in the PS3 USB port works and is currently the only way to input characters.
No virtual keyboard is supported at the moment.
Other stuff that does not work
TV-style remote controller (whatever that's called) has not been tested. No idea if it works or not.
BD/DVD/CD Discs - No idea how that works
Digital pass thru audio (AC3, DTS, etc)
There are probably plenty of those. Please use the issue tracker at http://www.lonelycoder.com/redmine/projects/showtime/issues/new
Build it yourself!?
Start by reading README here: https://github.com/andoma/showtime