For some time now I have wanted to reward guildies who participated in guild achievement runs but have not known how to track which people were involved. The new armory doesn’t list the characters, but there is a mouse-over in the in-game achievement interface that shows the people involved.
All you have to do is move your mouse over the green points value for the achievement and the list of participants appears. This is a great feature, and I hope that Blizzard makes it available on the web interface as well.
As a guild leader it’s a great tool, you can reward those who level their professions first, or who go back through old content for guild group runs, whoever gets that last reputation to exalted or anything else that your guild focuses on.