If you’re on openSUSE, you definitely want to upgrade to the latest MariaDB release made on 19/07/2011. Previous security fix disabled XtraDB! This is MariaDB 5.1.55.
If you’re using Gentoo, please test MariaDB 5.2 ebuilds in the MySQL overlay. Its current with MariaDB 5.2.7 as well as MariaDB 5.1.55.
The gist of it is, if you’ve installed Mac OS X and you use Homebrew, you’ll be pleased to note that you’re just a brew install away for getting a working MariaDB. Yes, that’s right, simply do: brew install mariadb and that’s it — you’ll have MariaDB (currently 5.2.6) installed in no time. For further documentation and a step-by-step guide, visit the Knowledgebase article: Building MariaDB on Mac OS X using Homebrew.
If you run Debian or Ubuntu, and want a way to auto-generate a sources.list entry, then you should definitely look at: Setting up Repositories for Ubuntu/Debian. Its very simple: choose a distribution, then a release, then choose what version of MariaDB you would like to track and a mirror of your choice, and voila! it generates the sources.list for you.