A lot of people asked to see a video of GDEMU running, so here it is, courtesy of a tester:

Note that this is a v4 unit so it has a “remote” attached with a flat cable. The v5 will only have one button on the main PCB and no remote – but will also feature solder points for additional up/down buttons should anyone want to mod their Dreamcast case and add those on their own.
As you can see GDEMU is very easy to install and use, doesn’t need any BIOS mods. You just swap out your GD-ROM drive and put the unit in it’s place. Having said that, my testers asked if it’d be possible to boot a simple menu for choosing the image to load – the answer is yes, I’m working on it, but it’s not a high priority task right now.

http://gdemu.wordpress.com/2014/04/01/prototype-demo/