Mobile learning is defined as the intersection of mobile computing (the application of small, portable, and wireless computing and communication devices) and e-learning (learning facilitated and supported through the use of information and communications technology). Consequently, it comes as no surprise that sooner or later people would begin to look for ways to integrate mobile computing into e-learning to make courses more accessible and portable. As the market for portable computing devices continues to expand, e-books are predicted to grow with them. In response, online bookstores have increased their holdings of e-books, with some publishers now including e-book versions of their printed college textbooks. Currently, companies are working on adding audio, video, and text-to-speech components for e-book software, which might--along with new usability standards--eliminate the barriers to their widespread adoption within the next few years. This article lists the most common mobile communication/computing devices, their features and functions, their potential instructional uses, and the pros and cons of using them for mobile learning. (Contains 3 figures and 16 endnotes.)