Fireworks (RIP) made it pretty easy to select layers and on mouse over. It was even highlighting what will be selected on click. Genius! Photoshop however is not that easy. Too many times I've seen users who claim they know Photoshop but struggle with something simple as selecting layer under the mouse cursor.
Example.. Imagine working with Marquee Tool. You made your selection there is however wrong layer selected. Sure you can go to layers palette and dig out layer you need. Wouldn't that be easier just to click the layer you after though? Well in Photoshop it is possible after all and the magical shortcut is:
CTRL + ALT + RIGHT CLICK
Right, there you have it. This is for Windows of course. I'm guessing on Mac you would have similar combination. I hope someone will find it useful.