The bad news is that it has been marked as an End Of Life product and removed from the repositories, they recommend using MySQL Workbench:
December 18, 2009 EOL of MySQL Query Browser, MySQL Administrator,
MySQL Migration Toolkit
With the beta releases of MySQL Workbench 5.2 well under way, we are
announcing the EOL of the MySQL GUI Tools Bundle.
The MySQL Tools team has been working on MySQL Workbench 5.2 to give
DBAs and developers an integrated tools environment for:
Database Design & Modeling
SQL Development (replacing MySQL Query Browser)
Database Administration (replacing MySQL Administrator)
MySQL Workbench 5.2 also provides:
Remote Administration (using SSH-Tunneling)
Python scripting and plugins
Native GUI for Windows, Mac, Linux
A future release of MySQL Workbench (post 5.2) will add a migration
plugin, providing features comparable to the MySQL Migration Toolkit
component of the MySQL GUI Tools Bundle. The MySQL Support team will
continue to provide technical assistance for MySQL Migration Toolkit
until such migration support functionality is released in MySQL
Workbench, but no new development or bug fixes will be provided
against the existing MySQL Migration Toolkit product.
MySQL Support will continue to answer questions and provide assistance
related to MySQL GUI Tools Bundle, as well as assist our customers in
upgrading from those tools to MySQL Workbench 5.2 until June 30, 2010.
Starting Dec 18, 2009, MySQL will no longer accept bug reports
submitted against the MySQL GUI Tools Bundle, and existing bug reports
against these tools will no longer be worked on. Users should instead
download, use, and submit bug reports (where necessary) against MySQL
Workbench. Downloads of the MySQL GUI Tools Bundle will remain
available, but will be moved into the MySQL Archives location.
Users should begin planning to upgrade to MySQL Workbench 5.2 GA.
Too bad, I really liked mysql-admin ;(