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The Muted Color effect is a handy to have around.
I've put together a script based on the discussion here: http://www.flickr.com/groups/gimpusers/discuss/72157603523283629/
The script can be found here: http://john.elkins.googlepages.com/elkins-mute-colors.scm
If you think the script would fit into the FX foundry your welcome to add it.