Multiple Servers, SSL and ISA

I wonder if someone can offer some advice.

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I have a collection of servers in the DMZ, let's say;

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1 Cluster of SQL Server (2 actual servers)

1 Sharepoint Farm ( 2 frontend web servers talking to the cluster)

2 independant web services

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Currently if we want a secure website within the SharePoint farm, SSL needs to be installed on both web server and in addition sharepoint needs to be configurated for SSL.

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Now I've read that ISA can do something called SSL Tunneling, that allows the certificate to be installed in a central place, i.e. the ISA server and then servers out the requests to the web servers (that have been setup up in some rule base).

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Am I correct in what i am say and also can I assume that informatio ...