There are a number of decent and *free* database management programs out there but I found Navicat to be well worth the money. (You might think it seems like a lot but if you're spending even a few hours/week managing a DB I think Navicat is good value.)

Unfortunately I'm stuck on version 8 because while the interface on 9 is much nicer, I find it crashes pretty much every time I use it. Sometimes it's because of a timeout on the server, sometimes it's just seems random.

There seem to be a few buggy interface elements that pop up from time to time as well (the enum default-value menu comes to mind -- it often chooses the values of the previously selected enum field).

So I'll stick with 8 for now. Hopefully 9.2 brings some stability.