git format-patch HEAD^..HEAD
This will generate a file called 0001-my-patch.mbox or similar (type ls -l 00*), which then you can email to be checked in.
* For more details, ask in the [http://forums.amahi.org forums], [https://sourceforge.net/mailarchive/forum.php?forum_name=amahi-devel amahi-devel list], or come by the [http://embed.mibbit.com/?server=irc.freenode.net&channel=%23amahi&noServerNotices=true&noServerMotd=true&autoConnect=true IRC channel]