What are you controlling with your Apex?

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Just installed my Apex over the past few days, got wireless and Internet access running and have fallen in love for the first time in years.

I am interested in what others are using their Apex to control.

So far I have:

Lights and light fan on a timer.

pH probe to control the solenoid feeding CO2 to my calcium reactor.

Heater controlled by the temperature probe (heater is set 2 degrees above the controller's heat setting for redundancy).

I am working on installing a float switch to shut off the skimmer, then I can be more aggressive about tuning my skimmer without worrying about it overflowing.

Is there anybody running the controller for other or non-standard uses, I would like to hear about other ideas to make the most of this equipment.