Just started playing around with this security TOOL for Android devices. It is in BETA but looks to be very promising if my phone is ever stolen or lost.

http://www.appbrain.com/app/android-lost/com.androidlost

Quote

REMOTE control your android phone from the internet or by SMS.

Features:
* read SMS inbox and SENT
* wipe phone
* lock phone
* erase SD card
* locate by GPS or network
* start alarm with FLASHING screen
* send SMS from web page
* message popup
* forward calls
* remote install
* phone status: battery, imei, etc
* remote SMS alarm
* remote SMS lock and unlock
* remote SMS erase sd card
* remote SMS wipe phone
* remote SMS APN control
* start stop GPS
* start stop WIFI
* hide from launcher
* email when SIM is changed
* get call list
* take picture with front camera
* take picture with rear camera
* make your phone speak with text to speech
* SMS message command
* SMS speak command
* lock timeout
* restore settings on boot
* record sound from microphone
* start and stop data connection from SMS
* start and stop WIFI connection from SMS
* content browser prototype
*
The app does no polling to a server, so there is no extra battery usage.

More details on the web site where you control it from: http://www.androidlost.com

Now...if only I had an Android.