Hi there
I searched high and low and could only find the ideashower plugin – which is hopelessly out of date for 3.01.
I ended up hiring a developer to get one sorted for me. Now I have a custom field that works great on the comments form and that shows up on the admin and in the notification email. Overall it works well.
It did cost me to get this sorted, and it would be nice to recover some of that cost, so I’d be happy to share the code (and developer contact for any additional mods you might need) with anyone who wants it for US $15 payable by paypal.
If you’re interested, you can reach me on: solaceten at gmail.com