Click and Drag Functionality in Web Apps with Python

[Wijaya Edward]

Hi,
 
Some recent webapps like Kiko <http://www.kiko.com/> , Google's gadget <http://www.google.com/ig/directory?hl=en> , and spreadsheets <http://spreadsheets.google.com>  to name a few, 
have this functionality. 

I wonder how can this funcitonalities be implemented in Python. 
Do you guys have any experience with it?
Any Python module that support that?
 
Regards,
Edward WIJAYA
SINGAPOE

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