using find to produce a list of file extensions in use

From: Eric (no_one_at_comcast.net)
Date: 02/21/05 

Date: Mon, 21 Feb 2005 12:59:00 -0800

I've been fooling around with find trying to get it to scan my directory
tree and tell me what file extension have been used. but i cant come up
with a combo of find,sed,sort & uniq that will give me what i want.
I want the list to look something like this:
html
jpg
png

Anyone?
Thanks
Eric 

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