Going back to the open/closed debate about Google's Android OS, the company just posted the code to the current "Ice Cream Sandwich" and previous "Honeycomb" releases.
This release includes the full history of the Android source code tree, which naturally includes all the source code for the Honeycomb releases. However, since Honeycomb was a little incomplete, we want everyone to focus on Ice Cream Sandwich. So, we haven't created any tags that correspond to the Honeycomb releases (even though the changes are present in the history.)
-Google Groups post, November 14, 2011