Boarding the Promethean Plane

I think I mentioned in some assignment or discussion post in the beginning of this class that I am interested in Promethean boards.  My sister-in-law teaches 3rd grade in Rutherford County, and she just got a Promethean board this year.  She seems to really like it but is still getting used to it and learning about all of its cool features.  I was able to briefly see some of its features when I visited her classroom after school one day about 4 months ago.  I know it can be worked from the computer and interacted with on the board itself.  I would like to know more about what it does and the benefits of having one in a classroom.  I would also like to have some ideas on how to involve the students in the use of it during lessons.  I am excited about learning more about the boards, especially because I know someone who will let me come play with one.  :)