The email highlighting other streams has been very helpful for me, just in getting to understand how best to use ThoughtStreams. My initial intended usage (daily development diary) didn't really pan out and I've struggled coming up with anything to use ThoughtStreams for. The email has been a big help in seeding ideas.
I shouldn't have to do the unpublish -> edit -> publish dance just to fix a typo. I should be able to directly edit published cards and have them stay published when I save the change.
Do we really need this on the bottom of every page?
"Built by Eldarion with Django and Pinax and hosted on Gondor."
Product Management 101: It's about your users, not you. The vast majority of ThoughtStream users won't know a Django from a Pinax and couldn't care less about a Gondor.
I'm +1 on being able to re-order cards.