If you are interested in playing with the current release version (0.2.0), try http://www.push-a-button.com.au/products/mce/vista/youglevista/index.php - however, this version has a number of known problem due to site format changes.
The current testing version is available from http://community.push-a-button.com.au - simply register yourself and go to the "Files" section, where you can download Yougle 0.3.0b
Definitely interested. Count me in.
P.S. How are you finding the new MCML language?