Thanks for all the comments.
I agree with Ed's thoughts and if I receive a mailto: link in a marketing email I don't enjoy the disjointed experience via email clients. However, using a landing page and form does deliver a lower response from our customer base.
I'm going to try the tracking URL idea from Mark. We've done some custom url tracking to see which button positions work best. By having custom yes and no URLs I can also add the Salesforce userID in Exact Target using AMP script so this could tell me who voted yes and who voted no.
Thanks for the reply Ed,
I usually tailor the maito: with subject= and body= so they know what they are replying about. It tends to get a good level of response as I am marketing to subscribers. We also use landing pages with a webform but find with customers we get a much lower response rate compared with prospects.
I am trying to get them to signal their intent to take part in product testing so I really only need a yes or no and an email address to confirm their details. As you say I've got all their contact details.
I think a test could be in order.
I use Dreamweaver as my main editor at work, but recently I have been using an App on my Android tablet called DroidEdit for coding at home and tweaking campaigns when I am out of the office.
I started with the free one and once happy that it worked on a 7" screen paid for the full app
Will check out Notepad++ though after a few mentions in this thread.
I would be nervous about embedding videos directly in emails due to the fact it creates a dead-end as stated in the article and requires a separate CTA which is not great for user experience.
I tried using animated Gifs for video links in a recent email. There is decent support (not Outlook of course) across email clients and they provide a short preview of the video content behind the link. They also retain the benefits highlighted in the article around SEO and click through traffic to the website. The fact they are eye-catching also helped drive increased click throughs to our training videos and had good fit with the subject matter.