I recommend lynda.com too. I've been using Photoshop for 10 years and recently started using Lynda. I've learnt so much more, I wish I had subscribed years ago.
I find video tutorials a great way of learning Photoshop. I find learning from book tutorials very hard, but that may just be me... With a Lynda subscription you also get access to tutorials for all sorts of other apps from Adobe, Apple, Microsoft to name a few.
I hope you find something that works well for you. I can't imagine my photography life without Photoshop, I love it! (And Aperture actually, I'm a recent convert to that).
Just read my post back - I don't work for Lynda.com BTW