Those two are the more known ones (I believe both are at PHOF).
this is the complete list of head-to-head pinball:
http://www.ipdb.org/search.pl?any=head-to-head&sortby=name&search=Search+Database&searchtype=quick
Then of course, there's the custom 3-way jungle lord:
http://pinside.com/pinball/forum/topic/check-out-this-3-way-jungle-lord