ThoughtStreams now supports embedding content from other sites just by pasting in a URL.
For example, paste in a YouTube URL and the video will be embedded in your card; paste the URL of a tweet and the tweet will be embedded in your card.
Many different services are supported, including YouTube, Twitter, SlideShare, Vimeo, SoundCloud, Flickr, and tens of others.
Note that we only embed based on naked URLs. If you markup the URL with Markdown's <URL> or [text](URL) it will just link and not embed the content.
Also, we have not applied this change retroactively, so if you want to take advantage of it on existing cards, just edit and save them.