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.
As Jakub Kaleta said, don't go around books, in my experience internet is your best teacher, free and available 24/7!
Just try to google what you want and if you don't know where to start, check websites like psd.tutsplus.com Good luck!