One of the new services MySQL Network will offer is a centralized graphical monitoring tool (complete with e-mail notification!) of database events. Easy-to-get but hard-to-monitor values of variables in SHOW VARIABLES or SHOW STATUS and some basic schema events are possible, and this is only the beginning.

This is a great tool to begin to do some real auditing. I think pictures state many words, so I'll show you what my instance looks like.

Here's a link to a picture of the overview, with the standard pretty graphs that come with it:

DashOverview

Here's a link to what the "Events" page looks like -- these events can be configured to e-mail you for notification.

DashEvents

And here's link to a page that lists the standard advisors that came with the system. VERY interesting.

DashAdvisors