Question : how do I set up an active/active exchange 2003 cluster on windows 2003 enterprise edition or better still should I

I have been tasked with setting up a new exchange cluster on server 2003 and wonder if I should set them up as active/active? As I have only ever set up active/passive before I am after any advice I can get.
I will be running this on HP blade systems with the shared storage on EMC sym each server has 2 HBA's and 4 NIC's so I have teamed 3 and used the last as the heartbeat.
We are running two sym frames so the servers are powerpathed. The reason I am asking about active/active is that it seems a shame to have all the resourse on either one or other of the nodes rather shall sharing the load.

Answer : how do I set up an active/active exchange 2003 cluster on windows 2003 enterprise edition or better still should I

Thats exactly what it is, just add a second EVS.   I'd start with http://support.microsoft.com/?id=815180 .  This article is a good resource for A/A Exchange and contains links to docs that should explain how to set it up.