NSM Transplant is an ExpressionEngine 2.0 port of LG Replace. The purpose of the plugin is to temporarily cache rendered tagdata and re-render it outside of it's original context eg: a {exp:channel:entries} tag.

A simple example

Inside your channel entry there is a list of related links in a textarea. Those links need to be rendered in a sidebar outside of the original tag. Here's how it's achieved:

{exp:nsm_transplant:body}

  {exp:channel:entries}
    {title}
    {exp:nsm_transplant:content id="my_entry_links"}
      {links}
    {/exp:nsm_transplant:content}
  {/exp:channel:entries}

  {!-- A second channel:entries tag --}
  {exp:channel:entries}
    {title}
    {content}
  {exp:channel:entries}

  {!-- 
    Inside the {exp:nsm_transplant:body} tag
    Outside the original {exp:channel:entries}
    Render the cached entry links with {my_entry_links}.
  --}
  {my_entry_links}

{/exp:nsm_transplant:body}

{!-- 
  Outside {exp:nsm_transplant:body} use
  {exp:nsm_transplant:output} to render the cached content
--}
{exp:nsm_transplant:output id="my_entry_links"}

The example above is simple but it demonstrates how to reduce the template by at least one {exp:channel:entries} tag.

A complex example

Here is a video on how Etsur use Matrix, Wygwam, NSM Transplant, ED Imageresizer etc. to accomplish user image/wysiwyg editing in ExpressionEngine on Vimeo.