Seems really cool but the signup on https://reddi.sh/ sends me to a 404 (https://reddi.us2.list-manage.com/subscribe/post?u=50cd9ee6a...).

Probably due too the Certificate for https used by mailchimp is for *mailchimp.com domains while you are on a us2.list-manage.com. It worked fine when i switched to http.

I used Chrome 17.0.963.12 on a mac.