Okay - here are some that I know of -
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Customer AA uses webhooks to push info into a 3rd party analytics/data visualization platform (leftronic) whenever a lead converts to MQL, Opportunity is won, for every Marketing/Sales email sent, etc
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Customer BB is using Webhooks to get an image URL from their accounting systems. The image itself contains the monthly activity in the customer's account. This image URL is inserted into an email (via a token) which gets sent to customers every month.
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Customer CC is using Webhooks to provision a 60-day trial account in their system whenever a lead fillsout a webform.
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Multiple customers are using Webhooks to remind patients 2 days before their surgery that they need to take certain precautions.
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Customer EE sends new email address to IronPort to check if the address is blacklisted
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Marketo also provides a webhook service to format phone numbers and geo-code them (ie, look up their location based on country/area code). Happy to share it with those who read this far and are interested in trying it :)
I'll pitch to include a "most innovative" webhooks prize in the 2014 summit.