I implemented a solution similar to this, customer had two links to 2 ISP's, and wanted to load balance outgoing traffic across both routers.
I ran OSPF on the Internet facing routers, and used that protocol to generate a default route. I ran OSPF on the pix (6.3) and it picked up 2 equal cost default routes, from the external routers. This allowed load sharing. Both router were connected to the outside interface of the PIX.
PIX OSPF in ver 6.3 supports upto 4 equal cost routes.
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