Hah, I had this idea in 2009 when the nook was announced:
https://www.mobileread.com/forums/sho...&postcount=250
Granted I did nothing with the domains, but it is a good idea.
Also, another guy recently had the idea as well:
https://www.mobileread.com/forums/sho...d.php?t=109188
Yes, these are for the nook, but the concept is identical.
I just think it would be easiest if MR created a nook and kindle sharing forum.