The boot menu and maintenance toolkit for EFI based Intel Macs has been updated to version 0.13. rEFIt basically allows to explore the EFI environment and supports installation and booting of many operating systems like Microsoft Windows, Linux and Mac OS X. It also supports booting from external drives.
The update 0.13 supports the newest Intel Macs (like Mac Pro). Also an auto detect feature has been added that should automatically support forthcoming Intel Macs. For installation at least Mac OS X in version 10.4 (Tiger) is required.