Joomla! 1.5 supports several types of Plugins for extending or integrating new features amongst others are content and searching types.

Search Plugin

EasyTable Pro currently includes a search plugin the allows Joomla to search the contents of tables you have imported/created in EasyTable Pro.

Through this plugin EasyTable Pro will return result to the standard Joomla! search function for tables or fields that you have. You can read more about it here.

Content Plugin

Content Plugins allow you to embed content from other sources into Articles within Joomla. Most content plugins are dealing with a small or limited amount of data. When EasyTable was first designed it was aimed at handling table with hundreds or thousands of records covering multiple pages.

Including a table of this size into the body of an article wasn't considered practical for the 1.0 line of EasyTable Pro, so currently a content plugin doesn't exist.

We do intend to implement a content plugin but our design requires the tables to be re-implemented using AJAX techniques so that your users can search and page through the records without the page having to be refreshed. AJAX tables are scheduled for a version after the EasyTable Pro 1.1 release (which is the version supports the 1.7/2.5 versions of Joomla!).

You can read more about the development plans here.