Use an interactive whiteboard for the following:
Some advantages of doing these tasks on an IWB:
• Teach to the whole -class

• Demonstrate an activity before students begin independent work

• Introduce and generate excitement about a new topic

• Write notes that can be printed and saved and posted to a class website

• Idea generation and concept mapping

• Review and revise at the end of a lesson or day

• Show a video or present an interactive website and annotate on top of it
• Teachers can be more flexible with their presentation of material

• Students can be involved in active full-class activities

• Images and multimedia can be easily integrated

• Past work can be pulled up and revisited

• Lessons and notes can be saved and printed

• It is easy for all students to see

• Teachers can do more with their full-class lessons using less prep time


References:
http://www.amphi.com/departments/technology/whiteboard/ideas.html
http://www.schoolzone.co.uk/resources/IWB/articles/maximiseweb.doc
http://www.fsdb.k12.fl.us/rmc/tutorials/whiteboards.html