What are some excellent resources related to advanced analog circuit design? This includes RF, sonar, audio, low-frequency, high power, low power, noise, amplifiers, etc.. To get the most obvious contender out of the way, I currently refer to...
The Art of Electronics 2nd ed.
by Paul Horowitz and Winfield Hill, 1989
It isn't exactly a cookbook, but it also doesn't go into detail about each design, so it requires an electronics background to use. As such, it is excellent.
However, I know there are more specialized and advanced resources available. What do you use?