[gz]

I know what Markdown is and yet this turned me off: "Ability to format posts with Markdown"

If that's a differentiating factor from CL then you have ways to go. Sorry to be negative - I just don't think any CL user would care. This is a feature worthy of a footnote.

[Todd]

Also, in my experience, average users don't have a clue about markdown or wiki syntax. Instead, they use their favorite (often syntactically incorrect) dash trains (for em dashes), exclamation armies, or whatever and end up with broken formatting.