Unity and it’s range of technologies brings simplicity, power, and integration to both users and application developers. Unity puts design, integration, and Free Software at the heart of delivering a powerful and attractive experience.
Install unity in ubuntu 10.04/10.10
Open the terminal and run one of the following command
sudo apt-get install ubuntu-netbook
sudo apt-get install unity
after logging out you will be able to choose Ubuntu Netbook Edition
Apart from this you can expect unity in Ubuntu 11.04 alpha1