This document summarizes a presentation on developing responsive websites for smartphones, tablets, and other mobile devices. It discusses using meta tags and CSS3 media queries to create responsive designs, grid systems like 960.gs and Blueprint to plan layouts, and jQuery Mobile for cross-device development. It also recommends testing websites on emulated devices using tools like MITE and KITE and considering performance, usability, and purpose when deciding between customizing or cloning content for mobile.