Kasper Johansen has posted to the PHP-GTK Community website some information about a new application that can help manage databases like phpMyAdmin does (and uses a PHP framework to do it - knj SQL-admin.
This application can manage a database for you, in the way phpMyAdmin does. Furthermore, it can convert various types of databases to another type of database (ig from MySQL to SQLite, Access to MySQL, PostgreSQL to MySQL and more).
You can get more information about the project and framework from its site over on SourceForge.