I’ve specified an alternate mechanism for quoting things from NetNewsWire and sending them to MarsEdit to post about, to wit:

[#title#](#url#):
> #body#

This works superficially, but if the body I’m quoting has more than one paragraph, clearly only the first one will have the quoting caret in front of it.

Gruber says:

Any decent text editor should make email-style quoting easy …

But I don’t think he imagined the use cases that Markdown might encounter, which is interesting because there’s a quote from him displayed on MarsEdit’s website stating that nearly everything he writes for Daring Fireball is through MarsEdit. Hmmm.