I have a Blackberry, so I had to phone a friend for this one. Using the iphone we crusied available downloads. Obviously twitter is a feature that can be used, but wow, Google Earth and math games? Very cool.
For more student use in the library I would be excited about Google Earth and Dexy, a neat way for kids to organize notes as they research. With all of this information available I can see writing a grant to get our foot in the technology door for these!
My district has also been blocked from editing wikipedia in the past. It's a shame because it is a great learning experience, all the better for us to create our own wikis with more security and accountability.