Anaconda

Anaconda is the installer for Red Hat Linux and Fedora and other distros based on these. It features a full graphical interface and also a text only console.

It supports many different types of installation and you can even script a whole installation with the complimens of a kickstart file which tells Anaconda how to install the OS. Anaconda has now been ported to a number of other Distros.

Wikipedia: http://en.wikipedia.org/wiki/Anaconda_(installer)