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Have you ever wanted more than two regions to put blocks in? Me too - thats why I wrote Flexiblock. Flexiblock has an admin page where you can allocate each enabled block to one of nine regions. Your themes can then invoke the blocks for each region: see the documentation for how - brief instructions are also included in the code.
This is a simple filter module to embed TeX-generated images into Drupal nodes, which is very useful for embedding complex math formulas in pages without making images by hand and uploading them to Drupal.
Similar Entries provides lists of links to site content related to the current node being viewed. Links can be displayed in standard blocks or in custom views. Similar content is located and rated using MySQL's FULLTEXT indexing for MyISAM tables. FULLTEXT is a special query that helps find relevant content in other nodes using a natural language search that interprets the search string as a phrase in natural human language. Views module is only required for version 2.x.