Grub2
From thelinuxwiki
https://help.ubuntu.com/community/Grub2
GRUB 2's major improvements
- Scripting support including conditional statements and functions
- Dynamic module loading
- Rescue mode
- Custom Menus
- Themes
- Graphical boot menu support and improved splash capability
- Boot LiveCD ISO images directly from hard drive
- New configuration file structure
- Non-x86 platform support (such as PowerPC)
- Universal support for UUIDs (not just Ubuntu)
gentoo grub2 resources
For information on how to configure GRUB2 please refer to the guide: GRUB2_Quick_Start
A migration guide for GRUB Legacy users is available: grub2 migration
Install sys-boot/os-prober to enable detection of other operating systems using grub2-mkconfig.
Install dev-libs/libisoburn to enable creation of rescue media using grub2-mkrescue.