My domain imagi.st was approved. I have validated the link http://imagi.st/quickstart.html as working. However, cards are still not displaying. E.g.: https://twitter.com/twizzlydick/status/332634837724823552
We are experiencing similar issues with our Twitter Card (https://twitter.com/PaperShare). The papershare.com domain has been approved in the Twitter Card Validator; however, the tweets for URLs (like http://www.papershare.com/paper/live-from-oow-whats-hot-at-the-show--intel-chip-chat-episode-222) do not currently appear as twitter cards.