Wow, this has gotta be one of the most powerful shortcuts in Photoshop, it does two clever things (almost 3!) in one keyboard shortcut!
As Photoshop documents get more and more layers in them you should make sure you keep your document organised by using layer sets which keeps your layers in nice little folders. There is a couple of new shortcuts in Photoshop CS3 that allows you to organise your layers super fast!
Here’s a nice tip – when you are drawing a marquee selection in Photoshop (little marching ants selection) did you know you can move the selection WHILST you are still drawing it – nope me neither until very recently!
Sometimes you need to merge all the existing layers in your document into one layer to either manipulate in a new document or in the existing document – and there is a great little shortcut for this!
This is a great little tip, especially if you have a-lot of layers! Sometimes you want to move a layer up or down in the layers palette and at the same time keeping an eye on your artwork to see how it is effecting your composition.