How can I copy a SQL Server 2008 instance to another server?

Kevin, the easiest way to bring across everything (if you are also keeping your instance name) is :-

1. Install a new SQL instance on the new server, ensuring name and paths are identical and ensuring you install all the currently installed SQL components (such as reporting services etc)
2. Patch this server to the same level as your source
3. Make a note of all the database paths on the source server (by issuing select name,physical_name from sys.master_files )
4. Stop your source SQL Server instance
5. Stop your destination SQL instance
6. Copy all database files to your new server (retaining same paths)
7. Start up your new instance (and old if you are retaining that).
8. Finally on your new instance, if you are not keeping the same machine host name then reflect this by changing the server\instance name via following this article http://msdn.microsoft.com/en-us/library/ms143799.aspx

For mirroring, see ms-help://MS.SQLCC.v10/MS.SQLSVR.v10.en/s10de_4deptrbl/html/8b37c0eb-8a70-45bd-9cc7-c54300711749.htm.

To get the logins that are on your source created on your target, run the sp_help_revlogin stored procedure: http://support.microsoft.com/kb/918992