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DbVis is GREAT and multi-db management tool http://www.dbvis.com/
As soon as I see "available on all major operating systems" I groan, because of course it seems to be a Java app. The user experience for Cocoa apps on OS X blows away that of a Java app. The reason Sequel Pro is great is because it feels like a first-rate Mac app and seamlessly fits in with everything else. You can make a Java app feel almost native on OS X, like with Cyberduck, but it is really, really hard and you…
I share some of your sentiments about x-plat Java UIs, but DbVisualizer does an admirable job. I now use on Windows for SQL Server for most tasks even when the native GUI is available. Its worth a look.