Surprisingly there is no child protection automatically on in the browser, meaning anyone using the OS can easily browse to not so children friendly sites.
Sugar on a stick does not require the user to install the .iso file, meaning that the user can trial and use the software on any device that has any OS.
Sugar uses Activities, which are apps that involve and engage the user in order to encourage him to learn. These activities save the results to a journal where reflections are recorded.
DouDouLinux comes as a live cd, meaning this distribution can be used on any computer not matter the OS in Live CD mode as well as installed fully onto the device depending on the hardware support.
DouDou Linux is based on Debian 5, which is pretty old. So this means the software found in the distribution will be old. This also means the hardware support will be lacking compared to newer based distros. So for those that do want to install it would be a good idea to make sure the hardware is supported by Debian 5 and DouDou Linux.
With the Live CD users can test and use the software without having to install the OS. The Live CD will also function no matter the OS on the device at the time.