In teaching both traditional undergraduates(17-25 years old) and non-traditional graduate students, I've found that age is not necessarily the deciding factor for judging a student's comfort level with technology. Some of my more media-savvy students have been my age or older, while some of those who struggled most were younger. In my experience, the following three types of technology (beyond the threaded discussions that take place online) are within the reach of the majority of my students and are the most useful teaching tools: podcasts, wiki-based group projects, and social bookmarking.
['Debra L. Beck']
Sensible Tools of Engagement: Three Channels for Online Education, and Why You Should Use Them