Instructables member KH4 isn't sure whether he should call his invention the cross bladed axe or the crossed blade axe. He cut an axe blade in half, then welded those pieces to opposing sides of another axe blade. Now when he splits a log, it breaks into four pieces instead of just two:
-via Hack A Day
With as much effort as he puts into that one swing, I'm not so sure this device is really saving work.
The last wood-splitter I saw on Neato has gone into production, and the reviews are pretty bad: http://www.amazon.com/Leveraxe-Splitting-Axe-Vipukirves-36-inch/product-reviews/B00KOUACZY/?filterBy=addOneStar