Joooid is an Android client for Joomla: it has been created to publish articles with text, images, galleries and geolocated maps (sample article), you can also save drafts to publish later.
Another Joooid feature is the article manager that allows to browse, preview, edit, publish or trash articles and an utility that uploads files from the Android device directly into your Joomla website.
To start using Joooid you need to download and install it from the Android Market then install the Joooid Plugin for Joomla 1.5 or Component for Joomla 1.6/1.7.

If you find problems in using Joooid, you can have a look in the forum.

If you like the plugin, you could write a review on the Android Market or Joomla extension directory and consider to make a donation.