I really like coins with strong or multiple die cracks. I even have an 1864 Bronze Indian cent that was struck with a shattered die - it looks kind of like a spider web, but I don't have a photo of that coin. However, this large cent from the Randall Hoard has one of the neatest die cracks because it circles around the entire coin right through the stars and even the date - take a look - then post your favorite die crack coin!
Unfortunately, I don't have an example of it...but there is one die crack coin that I am dying to get my hands on. I really want to pick up a 1861-O Seated Liberty Half Dollar with the obverse die crack. This crack is from the same die that was used by the Confederate States of America to strike their few half dollar examples. It would be cool to pick up one of the 1861-O halves that have that crack because of the history behind the die that made it. I don't have one, but it's on my list of coins.
Here's two that I definitely remember. This one goes all the way around, but in this image it can be seen at 12, 2 to 4, and 9. This one (large image) has a nifty die crack that goes from about 9 to 3 right through Liberty's head. And that hint of a line coming out of her bust is part of a die clash.