If you teach web design, you might be interested in this article at A List Apart that discusses issues related to the new Apple devices that display web pages. The section that caught my attention was that the file sizes of the various components of your page are once again important.
This hearkens back to a day, when a younger version of myself was learning html. Machine memory was more expensive and scarce. My instructors nagged about file size all the time. Pages loaded faster if your files were smaller. Pictures definitely came up quicker if you optimized them for the web. Then broadband got faster and storage got cheaper. Designers stopped worrying so much about file size.
Enter Apple and their new hand held viewers. Like the computers of old, they have limited ram and memory capabilities. This means pages that have been built with size in mind, will open faster. The article gives a nice overview of building sites that are iPod friendly.
[Image: "iPod Touch." Apple. 2007. Apple Inc.. 22 Sep 2007