Sequel Pro: Free MySQL Management Tool For Mac OS X
Sequel Pro is a free MySQL management tool for Mac OS X.
It offers full table management (including indexes), supports MySQL views, imports/exports from SQL/CSV files & compatible with MySQL 3/4/5 databases.

The application supports SSH tunnel connections besides standard local & remote connections for reaching databases behind firewalls.
It can connect to multiple databases at the same time, offers automatic syntax highlighting for your custom queries, supports ~30 different encoding options & much more.
P.S. The project is open source & you can check the source for improving it further.
Requirements: Mac OS X 10.5+
Website: http://www.sequelpro.com/
Download: http://www.sequelpro.com/download.html
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