Amending changes in a commit without modifying the message
Displaying only the files modified in a commit
Browsing the repository on a local web interface
(It requires lighttpd or other httpd daemon. Props to Cool git commands for this one.)
Search git history for a specific string
Bring a file from a specific commit
Useful when you want to try everything with the content of your current state, but you want a file/folder to have contents of a specific commit.