Ales Zabala Alava (Shagi) has made a nice add-on (transform) to Plone, to integrate txt2tags into it. Here’s the README file description:
This package gives Plone users the ability to use txt2tags syntax in their Plone site. Currently Plone 3.3 and 4.1 are supported.
In this transform the first three lines of txt2tags files are ignored letting Plone setting the title, author, etc.
Shagi also adds that:
Well, you heard him, now click!