If you're looking for a simple client to manage your online MySQL database, give YourSQL a try.
Personally, I'm still a great fan of myPHPAdmin, but this MySQL client looks quite promising (and it's GPL).
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It is certainly handy to create a database, edit a table's structure, etc. It's a little less practical when you wish to edit a table's data. It's done inline, a bit like a spreadsheet. I would have preferred a separate window, with one field per line e.g. But let's give it a try..
Need more info on how to install MySQL on your mac ? Go to Marc Liyanage's excellent
www.entropy.ch MySQL section for tips, tricks, HOW-TOs and installable software. We've previously mentionned
Marc's pages on Macinblog.