For everyone who wants to use git to follow along with Casey and do their own stuff here is a bash script to import the new files from each day into a git repository.
Put this script in an empty folder, create a subdirectory "source" where you put all the unpacked daily zip files and run the script inside that folder. It will create the git repository "HandmadeHero" there with one commit and tag for each day. When you get new daily source code files put them in the source folder and run the script again - it will only import the days that are not yet in git.
Couldn't attach the file. Here it is as gist: https://gist.github.com/5sw/ae6b72cd74137017712f