In patch 3.2.2 Blizzard removed the /saveguildroster function for security reasons. So if you have a large guild, or just want to keep a backup of your guild info, you will have no way of tracking your guild info or backing it up to off-realm storage.
This addon introduces a new slash command, /gdump, which addresses this need. When invoked it will pop up an edit box containing the guild roster info in tab-delimited (CSV) format for easy copy-paste into Excel or some other tool. It is very lightweight and uses almost no memory or saved variable space.