I like the idea of power plug proprietary-ness being written down somewhere, but if it were a real problem, I could probably find that information in user reviews on Amazon or similar.
So I'm just not sure that I can think of any instances where I would want to use a site that only tells me about the ideological aspects of my purchase, without particular reference to what the real hardware/software compatibility situation is, and which similarly doesn't give you the whole story in terms of whether I should buy from this manufacturer or not.
So in short, I wouldn't use it, sorry.
As someone who's done a lot of research into how open a device is before they buy, I've found that I spend a lot of time searching for products which meet my needs. The site should help cut down the time needed in order to find open products.
Whether it fills a specific gap is debatable. Perhaps we should look at building the user-driven 'review' aspect of the site more, and let people discuss functionality more.
Ho, stop, by who? The lay-out isn't very appealing and looks like it's still under construction. I get the idea of the site, but, what do you want to say with it?
People who care about open-ness of their 'to-buy'-device are more likely to do their own research, this site helps with that, but does it really fill a gap?