Chris Tingom of Brainfuel has produced a handy compilation of 10 Photoshop techniques that will be new to a number of Adobe Photoshop users, beginning or advanced. Here's a sampler-
* Pressing the shift key constrains proportions when you resize objects. Simple yet obviously not everybody knows this one. If you don’t hold shift, it stretches. Honestly, I think Adobe products should automatically hold proportions.
* Use the Alignment Buttons. If you have multiple objects and you want to line them up you can easily do so by linking them together and using any one of the alignment buttons that appear when you have the move tool selected. This tip is great for lining up multiple text strings or shapes.
Easy Photoshop Video Tutorials