VoiceFu is a FuBar add on that shows who is talking on your chosen voice chat program (eg: Ventrilo or Teamspeak).
Simply bind you press to talk button to the provided key bind (either in the built in Blizzard Key Bindings interface or directly from the FuBar menu) then get all the people using the same server/channel to do the same (that's the hard part) and you will never again wonder who that is yelling for a heal again!
Apparently a lot of people use keys that Blizzard considers modifier keys for their press to talk buttons (CTRL, Shift, etc.). Unfortunately, you cannot bind these keys in the program... I am going to try to figure out a way to work around it though. But don't hold your breath.
Screenshots will be up as soon as I can log in and get them.
This is the initial release, and might still have some bugs in it. Please report them. I was only able to test it with 3 people. Please let me know how its working for you.
Got rid of my debugging code that was spamming the chat frame... sorry again. :-\
Apparently I forgot to change a name on one of the lines I copied from elsewhere for the versioning. Its fixed now... Sorry