Bobby D, I see that the Send with Marketo functionality is only seen when I pop a GMail compose window out of it's window:
https://support.google.com/mail/answer/3231471?hl=en
but I don't see evidence that this is really working right.
To test:
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Pick your browser of choice and clear all of it's cookies.
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Go to your site (where muchkin code is embedded) and browse about for a bit, generating an anonymous lead in Marketo toed to the cookie you just got put in your browser.
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Create a Marketo lead through the Marketo UI.
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Compose and send an email to that lead that contains a link your web property (with the Muchkin code on it) using the Marketo plugin.
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Using the original browser, open the sent email and click the link in the email.
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This should "connect the dots" merging the anonymous lead activity (before the creation of the known lead) with the known lead. It has not done this for me to date.