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.

Gritter is a jQuery plugin for creating Growl-like notifications with ease.

The notification bubbles created looks very similar to the ones in Mac OS X & they can be styled easily if wanted.

It is possible to create multiple notifications where each of them can be controlled with their unique IDs.

They can be set to disappear automatically after x seconds or stay until removed manually with the "sticky" option.

You can also mention the speed of the fade effect used while the notifications appear/disappear.