I have a few different tools I use for managing MySQL on my OS X server. I've always been a fan of phpMyAdmin and have also used something called CocoaMySQL. But I was recently in a situation where I didn't have those available and needed something quick. After searching around some I discovered dbSuite Admin Tools X, a very nice piece of donationware for OS X and Windows for working with your MySQL server. The big bonus it has over CocoaMySQL is that it has user management built in (something I'm sure it will have eventually). These folks will be getting a little bit of a donation from me on my next round of payments.