Say What! is the the Add-In that reads out the Chat Messages as you receive them. Ideal for when you are in the room but not at your computer.

Office Secretary hooks into Outlook and lets people who chat to you know what time you will be out of your meeting ( if you are in one ) . It also allows people to add tentative appointments to your Calendar using Chat messages.

The 3rd Add-In which is still in beta is one that uses Google Translate to allow 2 people to chat in their native language and it will translate the message and send it to the other person in their respective native language.

Not sold any of these last 2 yet.