As a follower of the New Yorker magazine for many years, I read every issue cover to cover. I also study the cartoons. Going through every cartoon in its collection, from 1925, has made me a better gag writer. For those who read the articles and study the cartoons, there is a terrific website I'd like to make you aware of if you don't know about it already.
Michael Maslin, a long time New Yorker cartoonist, has created, since 2008, a very informative section of his website called Ink Spill, which gives information about past and present New Yorker cartoonists and their work. In it, you'll find news about book signings, exhibits, interviews and appearances. You'll find a short bio section and links to the cartoonists' websites and blogs. There's a library section which highlights books written and/or illustrated by the cartoonists. There's also a section of essays about the magazine and its cartoonists.
I read Ink Spill every day (as it's updated constantly) and I find it very informative and well-written. Because I write so many cartoon gags with the New Yorker in mind, I find it very helpful to find out more about the cartoons' creators and their processes.
You can find Ink Spill at www.michaelmaslin.com/inkspill.