Another nifty solution by Brett Terpstra:

Inspired by Evernote, I whipped up a little script to find “@reminder” tags with date parameters in nvALT notes (or any folder of text files). It can generate notifications or send HTML emails at the specified time. It’s just for fun right now, but I thought I’d put it out there to see if anyone had any ideas for it.

Brett is already working on Reminders integration, but I’m more interested in the idea of “self-hosted” Evernote-like reminders from nvALT. This is a great match for a TextExpander feature that’s not mentioned very often – date/time math macros.