I'd like to monitor and log temperature on few locations in my home. Wireless monitoring with normal consumer batteries etc would be preferable for the sensors. I have an Mac OSX server running at my home where I could log the temperatures and browse the data. I live in Finland, so something that's too specific for the US will not work.
Do you have any good suggestions or experiences on what wireless temperature sensors and system to use? I'd prefer something cheap but not too DIY as this thing is just a novelty for me.