I found this script on http://bradmarsh.wordpress.com/2008/07/29/sql-2005-mirroring-automatic-failover/
It is really handy for scripting out logins. The whole article is good though I’m not doing database-mirroring (yet) in my code! 
SELECT
‘create login [' + p.name + '] ‘ +
case when p.type in(‘U’,‘G’) then ‘from windows ‘ else ” end +
‘with ‘ +
case when p.type = ‘S’ then ‘password = ‘ + master.sys.fn_varbintohexstr(l.password_hash) + ‘ hashed, ‘ +
’sid = ‘ + master.sys.fn_varbintohexstr(l.sid) + ‘, check_expiration = ‘ +
case when l.is_policy_checked > 0 then ‘ON, ‘ else ‘OFF, ‘ end + ‘check_policy = ‘ + case when l.is_expiration_checked > 0 then ‘ON, ‘ else ‘OFF, ‘ end +
case when l.credential_id > 0 then ‘credential = ‘ + c.name + ‘, ‘ else ” end
else ” end +
‘default_database = ‘ + p.default_database_name +
case when len(p.default_language_name) > 0 then ‘, default_language = ‘ + p.default_language_name else ” end
FROM sys.server_principals p
LEFT JOIN sys.sql_logins l
ON p.principal_id = l.principal_id
LEFT JOIN sys.credentials c
ON l.credential_id = c.credential_id
WHERE p.type in(‘S’,‘U’,‘G’)
AND p.name <> ’sa’
