Bratched

With this plugin, you can import and auto traduct single post.This plugin can import item from WordPress or Joomla sites. You can also import HTML directly.The items with source code are managed properly and images are directly imported into the media library. Article becomes identical to a directly entered with WordPress interface. Very usefull to autotraduct post in multisite.
<ul>
<li>Import a post from a Worpress or Joomla Url</li>
<li>Import Tags and Categories</li>
<li>Import linked Image as Media</li>
<li>Import correctly source code description in Post</li>
<li>Translate Post (with Bing Translator)</li>
<li>Import from a source HTML page</li>
</ul>

Import Your Post

Import Your Post can import and auto traduct single post from an other site (Worpress, Joomla,...). Very usefull to autotraduct post in multisite.

ePeterso2

This plugin exports articles from a Joomla 1.5 database and imports them as posts into WordPress. 
It exports the content from a single Joomla category then allows the user to import the content 
into one or more WordPress categories.
This plugin does not convert Joomla articles into WordPress pages, although its framework would 
support such a conversion rather easily if someone would choose to code it.
This plugin does not work on Joomla 1.0 databases. If you need to convert your Joomla 1.0 data, you will first need 
to <a href="http://docs.joomla.org/Migrating_from_1.0.x_to_1.5_Stable" rel="nofollow ugc">migrate to Joomla 1.5</a>.
This plugin does not work on Joomla 1.6 databases. The Joomla 1.5 2-level section/category system has been replaced 
in Joomla 1.6 with a multi-level hierarchical system similar to WordPress. This framework could be adapted to support 
Joomla 1.6 in the future.

Joomla 1.5 Importer

This plugin exports articles from a Joomla 1.5 database and imports them as posts into Wordpress.

Import Your Post vs Joomla 1.5 Importer