RSS feeds, in conjunction with applications like Google Reader, can help teachers and students communicate, and put up-to-date information in a concise and close format.
Some cool RSS feeds I found include:
my brother's YouTube page: http://www.youtube.com/user/elkirkmo
the Hulu page for the ridiculously funny T.V. show, Community:
http://www.hulu.com/community
and Pollstar: the Concert Hotwire: http://www.pollstar.com/
