Add support for bold and emphasized Markdown in Trello card titles using a User Script.

trello-card-title-markdown.user.js

// ==UserScript==
// @name Trello card title Markdown
// @version 0.4.0
// @homepage https://gist.github.com/gorbiz/6062481
// @description Add support for bold and emphasized Markdown in card titles
// @match https://trello.com/b/*
// @match http://trello.com/b/*
// ==/UserScript==

function markdownAll() {
	var cards = document.getElementsByClassName('list-card-title');
	for (var i = 0; i < cards.length; i++) {
		cards[i].innerHTML = cards[i].innerHTML
		    .replace(/\*\*(.+?)\*\*/g, '<strong>$1</strong>')
		    .replace(/\*(.+?)\*/g, '<em>$1</em>')
		    .replace(/~~(.+?)~~/g, '<strike>$1</strike>')
		    .replace(/\`(.+?)\`/g, '<code>$1</code>');
	}
	setTimeout(markdownAll, 500);
}

markdownAll();

Hi @gorbiz,
Thanks for the update and oh no! This is such a useful tool to enhance Trello. I can vouch to both Google and Trello that is not suspicious and improves the clarity of using the Trello and improves team understanding and performance. The old version is referenced across the internet as a valuable extension. If you need me to complete anything when they come back to you, let me know.

In the meantime, thank you for what you have done so far in trying to get the extension re-instated. :-)

looking forward to the successful submission. Really needed the bold function at trello title too. :)