Hi, over the years I've worked to round out my design skills by reading books like Don't Make Me Think, the Non-Designers Design Book, Bulletproof CSS, and Handcrafted CSS.
One area where I feel like I'm sorely lacking is Photoshop. Right now I cobble some basic stuff together using Acorn. I'm looking for a good way of learning PS from the perspective of modern web/app design. I don't care about photo editing, etc. which many books focus on. I want to be able to rely on myself for cranking out your standard web/app elements. The more of this I can do on my own, the better since it means I can iterate faster without waiting for a designer to send stuff my way.
By no means do I think designers are irrelevant. I just need "good enough" to let me iterate faster. Any recommendations?
By doing tutorials you will learn a lot of tricks and concepts on how to combine layers, styles, create shapes, etc... at the same time you will get work done (with better or worse results but done) Then becoming a pixel perfect designer it's just a matter of practice, and by combining the tricks and concepts you will learn in the tutorials, you will be able to do whatever you may want.
You will find nice tutorials in places like:
http://psd.tutsplus.com/
http://www.smashingmagazine.com/