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Ethernet Shield W5100
Run webserver and have convenient SD storage in one place.
LB-LINK
Who needs wifi shiled when there is plenty of these!
LCD 20x4 I2C
Get the most important info directly on main unit's display.
4x Relay module
Control up to 4 high power appliances.
NRF24L01+ PA+LNA
Establish long range radio link between the units in the 2.4GHz band.
DS1307
Always have precise local time synchronised with NTP server.
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DHT22
Read air temperature and humidity at once.
BMP180
Get atmospheric pressure and calculate approximate weather forecast for the next few hours.
DS18b20
Get precise temperature readings in waterproof casing.
ACS712 + Voltage sensor
Measure power consumption of attached appliances.
HC-SR501
Enable motion detection capabilty (PIR).
Soil humidity sensor
Never leave your plants strive for water.
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Tipping bucket WH1080
Measure rainfall over time.
Photoresistor
Observe time of sunrise and sunset.