Well I guess I'm the only one using
Aquatic Log... I personally fell in love with it after trying their free trial. I like the fact that you can 'follow' other tanks to see updates and they also have a 'like' feature similar to Facebook (so you can 'like' photos). You can easily set reminders to do maintenance and it's compatible with several major controllers. The graphs are a really nice way of visualizing your tank's parameters.
If you are interested in signing up, please PM me your email so I can invite you and get the bonus points!
Here's a breakdown of features:
Log
Keep a log of your overall aquarium status, any unusual events, your fish breeding habits, and coral and plant growth.
Schedule
Schedule upcoming aquarium cleaning, equipment replacement, water change, feeding, dosing and more.
Record
Record aquarium temperature, salinity, pH and other parameters. Chart historical values to see how the highs and lows correspond with your maintenance activities.
View
See your latest measurements, records and activities on a single page, giving you a quick overview of your aquarium's health.
Share
Share your aquarium profile with others. Look at other aquarists' tanks and ask for advice on how to achieve similar results. Let others learn about aquarium keeping by studying your records.
Organize
Maintain a list of your fish, corals and plants. Keep track of your aquarium equipment and supplies.