Elmo

Elmo is a big hit with EI and pre-school aged students (and more than a few older kids and adults as well).

Here is a cute site that is touch screen and mouse emulator accessible. On it you get to make Elmo dance. Obviously only age appropriate (at least at school) for EI and pre-school. For more EI and preschool fun with Elmo check out PBS Kids
and Sesame Workshop's Elmo's World, this and other Elmo videos on YouTube (be careful many of the Elmo videos are satire and not ok for kids). Also Enabling Devices and TECSOL are carrying switch adapted Elmo toys. Here are some directions if you want to adapt an Elmo toy yourself.