This is a great article that covers a lot aspects of mobile web design showing the different considerations that need to be taken compared to desktop web design.
In some ways designing for the mobile web is similar to how we had to design for the web ten years ago. File size and connection speeds are all very important to consider especially with the increasing talk of major mobile carriers moving away from unlimited data plans. Screen size, amount of content and interactivity are important as well, the precision of the mouse is now replaced with fingers of all shapes and sizes.
It’s a little long but worth the read!