A lot of schools are considering i-pads for the classroom. Our school purchased six and they were distributed around but no one used them as they were unable to load any decent programs as the IT person was the only one with a password and had uploaded what she thought we would use. Not a good idea, they have been in the school a year now and sit on shelves. I would love to have a set in my room as they could be used in so many ways - using the apps I know would be of use. I wonder how many times this sort of thing happens in school. There are downsides though - small and portable means easily lost or stolen, especially as they are a very popular item.
Here is a link to a wiki made by a school using i-pads.