Enable the addition of an LCD, perhaps this would be a seperate program (?) which will query independantly of the main program and the web interface. Thinking the LCD would be display only (128 x 4, or something of similar size) and be used to show the environmental details and perhaps system status messages, perhaps add a proximity device so the display can be in power saving mode until someone is near the screen
Web Interface
Complete the Settings page
Add a graph to the home page (perhaps with a link to open a larger view) of recent recorded temperatures by zone
Add (to settings) user administration, enable the setting of admin user password