Some time ago I came across a website that displayed some simple system specs like the operating system, browser version, installed java version, screen resolution etc. I was great for when people called me with a computer problem because a shockingly high amount of people don't even know what os they're running. I've now gotten into webdesign and I'm having people test designs on their home computers. It would be really helpful if I knew what os, browser, screen resolution etc they had.
I stupidly did not write down the site when I saw it. Thanks.