Heh. That sounds awesome, actually.
Maybe we could make one with happiness, sadness, fear, anger, etc. as categories rather than standing alone.
Have you read Scott McCloud's book "Making Comics"? It's got that, plus a whole chart of Combinations of emotions, for example: "Shock+Anger+Sadness = Grief at loss of a loved one"
Finally, It has a few sarcastic or "mock" expressions, which are pretty important I think, though it's hard at times because they're so similar to the real thing.
Anyways, you should totally do a Round 2!
I will go make a "25 Expressions of Phrases" meme.
Sound cool?