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.