kguske writes:  

This December, 2012, article details Wikipedia's efforts to date and future plans to migrate the # 6 website from MySQL to open source fork MariaDB. Although Wikipedia's primary concern is for open and supported development, initial results indicate a hard benefit: performance improvements.

Unfortunately, it appears that the concern for support is also real - significant security issues remain 2 months and 1 release after being reported. For MariaDB, the issues were either already resolved before or have been after the report. Commercial support is available for both MySQL (owned by Oracle) and MariaDB (developed by the original developers of MySQL and owned by the not-for-profit MariaDB Foundation).

How does MariaDB factor into your database plans?