What is a good Photoshop book for photographers? I am interested in not too basic techniques (which I can more or less figure out by myself), which on the other hand give good results, without the need to be an expert pro.
I really have stopped using books, I think video's are far superior.
If you don't mind paying then take a look at kelby's site, they have linear generalist classes as well as specific technique classes.
I agree that the nature of the internet makes it hard to put anything cohesive together, and you never know how good a technique really is. As far as flow you might consider using a second monitor to learn and avoid the dreaded swap pattern.
Are you looking for a particular subject or just more advanced learning?
Ben Willmore http://digitalmastery.com/blog/ used to put out what was more or less a drill down of the nuts and bolts of CS for aspiring Photoshop chef's vs. short order cooks but he hasn't published anything other than e-books for awhile and the stuff on amazon is way dated.
The legendary John Shaw is a casual friend of mine that does really outstanding photoshop stuff in person ( he uses everything he teaches ) and he also sell's e-books which I have not used but knowing John they are probably top notch.
Other than that I would just say hit amazon, check the reviews, see what's interesting to you.