"...developers aged from seven to 70 can use Kodu to string together simple cartoon icons that define the rules of their game world, rather than using a complex programming language. Microsoft hopes Kodu will continue to be used to introduce children to programming, help them advance their design, math, and problem-solving skills, as well as encourage students to truly engage with computers, instead of experiencing them passively.." (link)
"The language is simple and entirely icon-based. Programs are composed of pages, which are broken down into rules, which are further divided into conditions and actions. Conditions are evaluated simultaneously.Kodu language is derived from gaming scenarios. Programs are expressed in physical terms, using concepts like vision, hearing, and time to control character behavior." (link)Go to this page at the Microsoft Project web site to see screen shots, and read more about the program.
Then go to Planet Kodu, the page "where you can learn about Kodu Game Lab PC and share your Kodu games and creations." Starting on March 1st, Planet Kodu is offering "a free online course that explores all aspects of game design with Kodu." You can also download the program there.
This video is a year old, so the information given at the end about "where can you get this..." is no longer accurate. Kodu is a free download for PCs at Planet Kodu.
You can read more about Kodu and its development at these web pages:
Microsoft News Center