How to link to an entry in a Markdown field in the CMS
I just figured out how to do this. It was vexing me!

Anyway, Craft is awesome and has provided support for Reference Tags.

Write your Markdown like this:

[link text]({entry:20})


Here's the Twig:

{{ entry.markdown|parseRefs|markdown }}


Reference Tags support more than just entries, but this was the bit that I needed.