rEFIt is a boot menu and maintenance toolkit for EFI-based machines like the Intel Macs. It gives you easy access to the EFI environment and serves as a hook for pre-boot applications.
What's new in this version:
This release supports the MacBook Air, hides the Apple Hardware Test entry in the main menu, and adds configuration options for increased security in lab environments.
Operating System Support: Mac OS X 10.5 Intel, Mac OS X 10.4 Intel