Grub Customizer is a new graphical GRUB2 settings manager. For now, it only allows you to edit the GRUB2 menu entries: reorder, rename or add/remove entries. Since these are actually scripts which generate the boot.cfg file, Grub Customizer changes the actual script order and then generates a new boot.cfg so if you then run "sudo update-grub", your customization won't be overwritten.
Even though these are very basic operations, such a tool is very welcome since most GRUB 2 options lack a GUI for easy tweaking.
Further more, Daniel Richter, the Grub Customizer developer plans to add more features in the future, like GRUB 2 recovery functionality for Live CDs or configuring the /etc/default/grub preferences.
Grub Customizer comes with an Ubuntu PPA (the first packages have been uploaded only a few minutes ago) so to install it in Ubuntu (Lucid and Maverick), use the following commands:
sudo add-apt-repository ppa:danielrichter2007/grub-customizer sudo apt-get update sudo apt-get install grub-customizer
Once installed, you can find it under Applications > System Tools > Grub Customizer.
To download the source code or report a bug, see the Grub Customizer project page @ Launchpad.
Update: Grub Customizer (stating with version 1.1) now supports BURG too!
For another GUI tool for managing GRUB 2 (but with a different set of options), see StartUp Manager.