Interesting article from MailChimp on using animated GIFs on e-mail .
They demonstrated some features on e-mails with animated GIFs. They look very nice, and more importantly, clearly show how these features work.
I do wonder how well these work for people with data plans. Even though they are very short, just these two add up to more than 200K. Just to compare, my lower resolution flash demos had more than a minute of content and had a few hundred Ks (Instant Demo is quite nice that way).
Even so, I still like the idea, and might use it when talking about new features on my products in the newsletter.