I hate to be "that dick" so let me first say that this is damn impressive stuff; kudos to the authors for some serious CSS wizardry! It's also completely and totally useless. The person / people who did this are obviously talented and have a lot of expertise. I'd really rather see people with this level of ability contributing meaningful, useful tools / techniques to the community rather than seeing this type of post…
Anywhoo, that's awesome. And I do think it's useful - as mcknz says, it's a pretty great starting point. It's also pretty great motivation :) From this, people can derive practical value.