In the mysql section of phpinfo() it shows:

MySQL Support enabled
Active Persistent Links 0
Active Links 0
Client API version 3.22.32


...I got the source tarball of MySql 3.23.33 and compiled/installed that yesterday --- shouldn't this be reflected above? there's about 40 users in my forums now, why would Active Links be 0??

The MySQL client is compiled into PHP, so installing a new version of MySQL will not change that value.

I'll yield to someone else on the "Active Links" stat.