In SQL 2000 for a standby server, I would just start SQL in single user mode, restore master (permissions), msdb (jobs, DTS packages), user dbs and rename the server to the machine that failed. I would then be off and running.
I believe with mirroring, I'd have to update logins etc.. on the mirror when I update them on the principal manually? I only add logins maybe once a month or so. DTS are probably similar and relatively simple exports / imports.