I have been looking for Kindergarten resources for math and found this interactive...http://illuminations.nctm.org/ActivityDetail.aspx?ID=218. That lets you use your interactive boards to count and group cows. This is good for teaching grouping which is a pre-skill for addition and substraction.
I find interactive sites from Illuminations to be very beneficial. Resources such as http://illuminations.nctm.org/ActivityDetail.aspx?ID=34 provide instant corrective feedback for out 21st century learners. Sharing such reasources during training is important so that teachers are aware of resources available to their students while using interactive white boards/student computers in the classroom.