Just wanted to point you in the direction of a very nice video that’s available on the Teacher’s TV Website
It’s aimed at Primary Science teachers, and gives 7 different lesson starters to use on your Interactive Whiteboard.
All the starters are in one file, so I would suggest making a note of the time that each clip starts (or download the timings file from the downloads page) so when you use it with your class you can jump to the required clip using the video player slider.
You can view the video here: http://www.teachers.tv/video/28260
There are also some associated documents to go with the video in the Downloads page.