The biggest one I know of right now is that it's being used by one of
the largest aggricultural companies in Canada. Although I don't know if
I'm allowed to mention them by name. Rob Parkhill blogged about it
recently.
http://agfusion.blogspot.com/2009/06/frameworks-ontap-and-my-decision.html
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[ ike ] founder - onTap framework
phone: 817-385-0301