Widgets - here are some I have tried and some I want to try. They really dress up your blog or wikis and adds classroom colour to the web 2.0 walls.
SchoolhouseWidgets.com.
widegets for you blog http://mashable.com/2007/09/06/widgets-2/
TimeandDate.com.
Feed2JS.org
RotateContent.com for deadlines and study tips


www.weatherpixie.com
www.easy-hit-counters.com
www.clustrmaps.com
http://blog.missiontolearn.com/2008/03/more-than-50-web-widgets-for-your-learning-mix/