I was asked by a partner about this and had to admit I have no experience of doing it. Fortunately I cam across a great write up of some lab work we did earlier in the year - check out http://www.microsoft.com/technet/prodtechnol/sql/2000/deploy/32bitconsolidation.mspx. From there I came across Http://www.microsoft.com/serverconsolidation  which has info across many of our products and a comprehensive guide to download. Enjoy.