use [yourdatabasename]
exec sp_change_users_login 'Report'
Will Output Something like:
user1 0x68940EDA46DDD44E9E25F834E4839F74
bsmith 0x37D7D1FFAC865F44AB99CABFA92E5932
jdoe 0xD12465F809AD2940AAFBB938F0270A9C
webuser 0x7C4538615AFD874E999A528283A5793B
These are the orphaned users.
Enjoy!