Richard,

There are many ways of doing this. The best way to accomplish load balancing is to use a load balancing device like radware or resonate.

[url]http://www.radware.com/[/url]

[url]http://www.resonate.com/[/url]

We have been very successful using resonate to load balance our servers and you can have them come in and to a technical review for free.

Let me know if I can help