The list of features:

• 1.8.x Provide more information about the users (the last add/edit date, browser/OS, IP).
• 1.8.x Implementation of new interface translation engine.
• 1.8.x The ability to export just one or several custom pages at a time.
• 1.8.x Random term.
• 1.8.x The ability to include images in the definition (partially done).
• 1.8.x The ability to include audio in the definition (partially done).

• 1.9.x Topics inside dictionaries (also called as "tags", "subdictionaries")
• 1.9.x Bibliography.
• 1.9.x RSS capability.
• 1.9.x Search engine API.
• 1.9.x Social bookmarking.
• 1.9.x Support for MySQLi.

Application design:

• Extend User management.
• Create a "normal" HTML-editor.
• Add RSS for almost any updated data.
• Add support for MySQLi, PostreSQL, MSSQL.
• Remove "Clean cache" from interface. All caching schemes should be transparent.
• Implement the complete Unicode normalization (partially created for 1.9.x, 28.833 transformation rules).
• Replace the text of database queries with dynamically created queries. Use ActiveRecord, for example.
• Get rid of XML in stored data. All dictionary entries should be stored as database relations. Better if it would be InnoDB.

Other suggestions are welcome.