Multiple internet connections

Anyone ever try load balance/fault tolerance with single ISA server and 
multiple internet connections (T1 and DSL)?

I have Cisco 2611 router with external interfaces for both and single interface 
for internal ISA server. Does anyone know how to "publish" internal server (via 
NAT Map or other method) on Cisco router for 2 interfaces?

If not, anyone have any other ideas?  Other than 2 ISA servers.

Thanks in advance.

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