We wont multitouch on windows 7. if you merge this https://code.google.com/p/tuiokinect/  + this http://multitouchvista.codeplex.com/

you can modify this http://code.google.com/p/wiituio/

For all the developer:

look this video

http://www.youtube.com/watch?v=kipvbVTAmWk

source of this work : http://sd-tech-blog.blogspot.com/2010/12/kinectopenniflash.html

the source code in visual studio 2010 : https://sites.google.com/site/sdtechblog2010/home/blogdata/NiUserTracker_sdtech.zip?attredirects=0&d=1

the flash part: https://sites.google.com/site/sdtechblog2010/home/blogdata/KinectFlash_sdtech.zip

if we enable this program to output tuio message, we can use multitouch-vista for the best multitouch air system