Asterisk Tapi Driver

We're looking for someone to create a branded Tapi driver to be used by our clients. The driver will be used to allow them to do click to call through Tapi compliant applications (Microsoft Outlook, Goldmine, Act, etc.) The driver will need to allow them to register as the appropriate extension on our hosted pbx servers which run Asterisk 1.6. The driver must support Windows XP, Vista, and 7, both 32 and 64 bit. Additional functionality is a plus, but all we really need to be able to do Day-1 is to allow our clients to make phone calls. If you have questions on the spec, please don't hesitate to ask. There are several open-source solutions out there that you can use as a reference.