I ran across this website and it really bothers me how similar it is to SO in EVERY aspect without giving any credit whatsoever and even copyrighting the website for themselves. Is this legal?
Regardless of the fact that this particular site is Stack Exchange one, of course clones are legal. If it's written from the ground-up, then its someone else's tool.
There have been a variety of clone projects already started, such as: Stacked - an Open Source implementation of StackOverflow.com; Am I allowed to make a Stack Overflow clone?; Is codekicker using the software behind StackOverflow or did they program a clone?; Is this Russian site a legitimate copy of the Stack Overflow package?
It looks like a Stack Exchange site, which would be 'legal'.
Wow you get prizes for reputation on that site!
Jon Skeet could make a killing.