You do not need Linux on your PC to install it and the dingoo does not need to be connected to the PC to run Linux anymore. I havent installed it yet (because I am lazy or not had the time yet)
Here is the "dingux" page http://www.dingux.com/
And here is a good blog for keeping up with the latest releases/news: http://dingoo-scene.blogspot.com/
This is a new launcher for dingux. Before this you had to use the command line to launch stuff in dingux:
[ Show youtube player ]
I believe MAME is being ported for dingoo Linux only atm. You may as well jump on board the dingux bandwagon, looks like all the cool stuff is coming out for it and you still have access to the original dingoo OS.