These are the only wild mushrooms I will pick and eat, and they are delicious! They are the only ones I trust because they're pretty darned easy to recognize. There are mushrooms known as false morels, but they look different enough and are not hollow when you cut them in half.
DISCLAIMER: It's entirely your responsibility and not mine if you decide to go find some of these, eat them yourself, and get horribly sick or die because you mis-identified them!
However, there is an excellent section on true morels and false morels on MushroomExpert.com that may help you make a more definite identification.