I'm stealing some ideas from Travis.... sorry buddy.
-Measures, charts and uploads data to a nice web statistics program that's modifiable and scalable, kinda like iGoogle homepage. So basically, no matter where I am I could log in and get tank stat updates... kinda like a stock ticker... updated every 10min or so.
Temp
SG
pH
Alk
Ca
Ammonia
Nitrates
Room Temp
Outside Temp
--Controls
On/Off lights (Auto)
On/Off pumps (manual) - for feeding and maintenance
Auto-Dose Ca/alk
Control pumps/powerheads (like a tunze controller does)
Allows a "wavemaker" option
Ability to dim lights instead of On/Off
--Water Alarm... When water hits the floor everything shuts down. I get an alert email, cell phone call & work call.
--Misc
ONE PLUG! I would have a huge box to plug the lights, pumps, etc into that way only one plug goes into the wall. Basically make it a built in GFCI
Video Monitor!! Video monitor and stream from 5 or 6 cameras to show livestock. Ability to pan/zoom at least one camera.
This is the BIG one for me!! I want it to be fully controllable via web interface. For example if I'm out of town I want to be able to shut down pumps, skimmer, lights...etc. System override if you will. So if for some reason I'm seeing a temp spike for some reason I can kill the halides to keep things from getting out of hand.