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I have seen this phrasing as

And what's more -

And what's more,

And what's more!

Which one is most proper?

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He gave me some s'more. And what s'more! The most delicious I have ere now had. – Jon Purdy Dec 5 '10 at 9:46
up vote 3 down vote accepted

Normally, you have something to follow:

  • And, what's more, he also did that!

With the following text, it is clear that an exclamation mark after the phrase is inappropriate. The dash is not appropriate either - it is used to mark a break of some sort, but the text that follows "what is more" or its contraction "what's more" is a continuation of the previous thinking, not a contrasting thought.

A comma is fine; what's more, it is the punctuation I'd use automatically.

Whether the comma is necessary, or allowable, after the "and" is perhaps a little debatable. As you can see, I'd use it; and, what's more, it feels right because there is a small parenthetical break around the "what's more" part of the phrase.

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