Rails - Nov 2008 - looking for a plugin that does multi-list/select managment

Hi

	I''m looking for a plugin that will take the pain out of constantly  
re-implementing a UI ''functionality'' (for lack of a better
term) that
I''m using often.

	This functionality consists of two select (listboxes) - side by  
side.  The one on the left has a list of items that the user can  
choose from and then by clicking on a button - move the selected  
items from the select list on the left to the select list on the  
right.  The user also has the ability to change their mind and move  
items from the select list on the right - back to the select list on  
the left.   It looks something like this ...
	

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	For what its worth - this UI ''metaphor'' used to be used by  
tv.yahoo.com when users would select their favorite channels from  
their tv lineup.

	One could accomplish the same thing using a set of checkboxes - the  
user essentially just checks a checkbox to indicate that they want an  
item - analogous to moving it from left to right above.  The problem  
with the checkboxes that the above select list boxes address is that  
the number of items that the user has to chose from is in the  
hundreds, and obviously navigating that many checkboxes is really  
cumbersome .
	
	I''ve implemented a solution that works well enough - but it really  
''feels'' like this should be available as a plugin.  So, my
question
is simple, does anyone know of any plugin / gem that abstracts some  
of the aforementioned list ''behavior''  ?
	
Thanks
Dave