I thought it may be a good idea to drop a copy of the Opsmgr SP1 Upgrade guide here for those planning deployments. Lots of information to take in and a few caveats besides. This can be found on the SP1 RTM CD image in the ProductDocumentation folder
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Read the complete post at http://blogs.technet.com/cliveeastwood/archive/2008/02/22/operations-manager-2007-service-pack-1-rtm-upgrade-guide.aspx