UPDATE MySQL 5.5.30 - The world's most popular open source database.

MySQL is a well-known relational database manager used in a wide variety of systems, including Twitter, Wikipedia, Facebook, Google, Wordpress, and countless more websites and other applications. Offering a wide range of features and highly scalable performance, MySQL is a good choice for any situation requiring a database.

Features

• Cross-platform support.
• Stored procedures, allowing you to centralize SQL calls.
• Triggers, allowing automatic responses to different actions.
• Cursors, allowing easy traversal over database records.
• True Varchar support.
• X/Open XA distributed transaction processing support (with two phase commit as a part) using Oracles InnoDB engine.
• Independent storage engines.
• SSL support.
• Query caching.
• Sub SELECTS.
• Replication support with one master per slave, many slaves per master. No automatic support for multiple masters per slave.
• Full text indexing and searching with MyISAM engine.
• Embedded database library.
• Partial Unicode support.
• ACID compliance when using transaction capable storage engines.
• Partitioned tables with pruning of partitions in optimizer.
• Shared-nothing clustering through MySQL Cluster.
• Hot backup under certain conditions.
• Multiple storage engines, allowing developers to choose one that is most effective for each table in the application.
• Commit grouping, gathering multiple transactions together to increase the number of transactions per second.

Download updated version 5.5.30 released on 05/02/2013
Download mysql-5.5.30-win32.msi (32.7 MB)
Download other versions from here

Release notes on Mysql 5.5

Changes in MySQL 5.5.30 (2013-02-05)

Source-
http://sourceforge.net/projects/mysql.mirror/
http://dev.mysql.com/doc/relnotes/mysql/5.5/en/