DruTeX is a powerful LaTeX module for Drupal. It can be used to display mathematics written in LaTeX as images inline with other text, or separately as a downloadable pdf.
Features include:
rendering of maths or arbitrary LaTeX via latex + ImageMagic / dvipng
support of classical LaTeX-math environments like $x^2$, \[ x^2 \]
some plain latex2html and html2latex facilities (no external program needed)
pdf generation of nodes (with LaTeX)
highly-configurable input formats
security-enhanced modes (to allow even anonymous users to write latex)
Drupal / LaTeX UTF-8 (utf8) support
Able to remotely render LaTeX on a foreign server if your primary server doesn't support LaTeX
Here's your reason, basically the theming changes in D7 mean the field theming gets bound a lot lot later in the process, so it's not possible to generate the output into a Textarea for you to edit - that said, it is possible that we can come at this from another angle and use tokens instead BUT it means what you see in contemplate admin page will be nothing at all similar to the output.
The Content Template (a.k.a. ConTemplate) module allows modification of Drupal's teaser and body fields using administrator defined templates. These templates use PHP code and all of the node object variables are available for use in the template. An example node object is displayed and it is as simple as clicking on its properties to add them to the current template.
This module aims to provide a full implementation of the Gallery project's Gallery Remote Protocol in order to support publishing images using Drupal's Image module.