I had been using the Mac OS X Quicklook generator for Markdown by Phil Toland, but I came upon a fork of his code by Michael Dominic K. that I like better. By now the fork largely has no purpose since Phil’s code now uses the discount C library too, but I like MDK’s .css file better since it is minimal. The nice thing with a Quicklook plugin is that it gets Spotlight to index the .md (or .markdown, etc.) files so the content is searchable. I did notice that MDK’s doesn’t include the .text extension, and I can’t figure out how to activate it. Maybe I’ll try to replace the .css file of Phil’s version.