This is idea I have had for some time but never really got started on it.
A weather station based on a Arduino. The Arduino receives the data from sensors and sends it to a webserver (whit PHP), probably gonna use Apatche.
Keep an eye on my blog for more info soon.
Partly based on this small project I made a little over a year ago: http://youtu.be/0a3Uw4ah8bU