Due to some sweeping changes that are coming down the pipeline at work I've got to change IP's for a number of SQL clusters that are in production. Having gone through enough nightmares while originally setting up these clusters over the years I wasn't looking forward to it... but since I had enough lead time I took some lab assets to mirror the production setup so I could play with it before crunch time.
I'm posting the following reference to a Microsoft KB article for my own benefit and for those who might be looking for such a solution as well. I've done these steps in the lab today for the SQL 2000 instance and it worked like a champ - exactly according to the KB article...kind of a rarity in the tech world since there are so many variables out there.
Enjoy!
How to change the network IP addresses of SQL Server failover cluster instances