3rd party controls

Has anybody created publicly available controls inherited from Prototype and
Scriptaculous libraries?  

For example, a rich dropdown control would be helpful, and it will reuse a
lot of the same code as the autocompleter dropdown.  No reason to reinvent.
There's a lot of controls on the Wish List, and I'm sure there's developers
out there creating their own controls which may or may not eventually be
merged into the source base.

Maybe there should be a page on the wiki for 3rd party implementations and
enhancements?

BTW, http://ajaxpatterns.org is a great resource for what these controls
should/could do.

--
Dylan Greene
http://www.DylanGreene.com