Recently (on April 19, 2010), Monty gave a Google Tech Talk, titled: MariaDB: The Backward Compatible Branch of the MySQL Database Server. The talk is under 47-minutes long, and the video is embedded below. Its a good introduction to what MariaDB has been up to for the last year+, aims, goals, and the future.
MariaDB, the Backward Compatible Branch of MySQL(R) Database Server
Watch this video on YouTube.