A clever use of RSS without explaining to the users that this is driven by RSS. Very nice but the software is proprietary... maybe alternatives will pop up.
Could you elaborate on what you mean by proprietary?
Maybe he/she is referring to the fact that this is running on Adobe AIR?
But aren't all desktop applications built on proprietary technologies? I am curious.
Firefox (without proprietary plug-ins), vim, gimp, Pidgin, GNOME, Inkscape, Evince, F-Spot, VLC, MPlayer, Thunderbird,... are not built on proprietary technologies.
Aren't they ultimately all built on top of Windows and Mac? (Which are proprietary technologies)