I tried using Markdown to add a link to a checklist item in Trello, but it doesn't work.
Is there any way to do this?
It would appear that you cannot create a clickable link in a list item. However, you can create a clickable link in the Description area (back of card) by simply putting in a well formed URL, such as http://google.com And you could create a list of such links using Markdown syntax. Start each line with either an asterisk or a number followed by a period.
Of course you could also Use [Markdown Syntax](http://daringfireball.net/projects/markdown/syntax "Markdown") for an inline link.
Of course you could also Use Markdown Syntax for an inline link.
It looks like this feature wasn't around when this question was asked, but things have definitely changed :)