We have tried several of the applications (called activities) and the basic functions seem OK. Vivien liked it and was quite curious to explore it further. The photos you can take with the built-in camera are similar in quality to a good web cam.
After discussing the Microsoft Vista interface guide in the last week of our course on User Interface Engineering it was really interesting to see the OLPC/Sugar user interface guidelines. Especially the shift away from save/open to keep and the journal are enormous changes (and hence probably quite hard for people who have used computers – obviously it is not really designed for them).
Using the measure activity provides basic tools for electronics measurements. The microphone input can be used as a simple oscilloscope and the USB port provides 1A – this makes it really interesting for experimenting, see the hardware reference.