Believe it or not, more people have access to mobile devices than desktop computers. Many handhelds can access the Internet, including cell phones, Palm handhelds, Pocket PCs, Nintendo DS's, and Sony PSPs.
The problem is most websites are not convenient to use on a handheld's small screen. So, many sites provide a mobile version of their content. For example, USA Today provides their current news stories in a simplified format at m.usatoday.com.
In 2006, mobile websites got their own top-level domain name: .mobi. When visiting sites like google.mobi on a mobile device, you know you're receiving content formatted for a handheld. Over half a million sites have been registered as .mobi and many more are on the way. Unfortunately, there remains a variety of ways that a website may format its mobile web address, making it difficult to locate a mobile site (if there is one). Once you find a useful mobile site, be sure to bookmark it!
I've added a section to Learning in Hand to help educators use the Mobile Web. I provide plenty of sample sites and tips for classroom use. Educators might be interested in making their own mobile site, so I've included a page with information about ways to create your own mobile homepage. Many web publishers are creating mobile versions of their sites because more and more people are accessing with web with a handheld.