I manage all of my plugin support through bbPress. With dozens of replies posted to tickets every single day, one of the biggest bottle necks is writing out each reply. This free extension for bbPress allows you to create canned replies that you can quickly insert when replying to forum posts.
A canned reply is one that is predefined, meaning you are just giving the user a pre-written response. This is immensely helpful when you get the same question(s) posted over and over again.
Do you have a recurring problem with one of your plugins that affects a lot of users? Create a canned reply for it.
Do you have a known and common conflict with another popular plugin or theme? Create a canned reply for it.
Do you have any kind of response that you write out over and over again? Create a canned reply for it.