Migrate SharePoint user settings
Last week I was migrating a SharePoint (WSS) installation from a domain to a workgroup and needed to clone a users configuration to a different account (so, from NWTRADERS\Dave Hope to LONDON\Dave Hope).
Thankfully Microsoft provide a tool to do just that:
STSADM -o migrateuser -oldlogin "NWTRADERS\Dave Hope" -newlogin "LONDON\Dave Hope" -ignoresidhistory
STSADM is stored in C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\BIN\
Bear in mind that you may need to alter the display name etc if you’re migrating the settings to a different individual.