Ethan Marcotte has been hailed as the pioneer of the responsive web design. He did after all coin the term, so who better than him to teach it? Making extensive use of CSS3, Ethan shows how to use semantic code, screen types, and queries to overwrite rules based on screen size.
Mobile web has more users than ever before and now for the first time ever out numbers non mobile devices. Hence having mobile sites is important without a doubt. However, it is not feasible to make websites for each and every type of mobile device and their resolutions. Responsive Web Design aims to solve that problem.
The main concept of the book is in making flexible template based on percentages and ems, instead of fixed pixels and width tags. Responsive Web Design is not a codebook and is a case study based book.
Responsive Web Design is released by A Book Apart, and just like all their titles is very brief and too the point.