DIY home alarm system with Linux

[Andrew Pollock]

Hi,

I thought it would be fun to make my own home alarm system with a Linux box (I
have a GSM modem too, so I could make it call me/SMS me if needed).

Does anyone know of or have any experience with any wireless sensors (I'm
guessing they'd need to run on 802.11) or know if this kind of thing has been
done already?

I'm off to do some Googling.

Andrew