"The Homer Multitext seeks to present the textual transmission of the Homeric Iliad and Odyssey in a historical framework. Such a framework is needed to account for the full reality of a complex medium of oral performance that underwent many changes over a long period of time. These changes, as reflected in the many texts of Homer, need to be understood in their many different historical contexts. The Homer Multitext provides ways to view these contexts both synchronically and diachronically."
--Homer Muititext Project website
If you are interested in the textual history of the iliad, this wonderful resources has articles, high-quality images of early manuscripts, and more.