Now your phone has a "Guardian"
I know this probably old news to most of you .... but I only found it today, courtesy of Armand's post here, and think it rocks!
quoted from Symbian Tools, the developers of this little gem....
"Guardian is the new anti-theft system for Symbian Series 60 devices.
Every time you switch on your mobile telephone, Guardian proceeds with authentication of the inserted sim card; if authentication fails, Guardian sends a notification sms message to a previously set telephone number."
So simply put, if some scourge kindly relieves you of your phone, the next time the phone is booted up (switched on for those less inclined to understand IT speak) Guardian will check the new Sim card against a list of preconfigured cards, if it does not match it will notify you and proceed to switch off the phone....
Guardian is available for download ( currently free of charge, donations accepted though and for something this good they deserve donations ) here;
If you make a donation other functionality will be unlocked to you, like;
"It allows also to gain information about the thief, like his sms sent & received, calls made & received, and contacts added by the thief."
Styling if you happen to own one of the following phones ...
Nokia: 3230 / 6260 / 6600 / 6620 / 6630 / 6670 / 6680 / 6681 / 6682 / 7610 / n-Series
Samsung: SGH-D720 / SGH-D730
To those of us "lucky" enough to own a Microsoft Windows Mobile based phone like my brand spanking new Htc S710, well we're not so lucky ...
So, when next I suffer from insomnia guess what I shall be building as my first .NET CF application 
Then when Red Five Labs's release the final version of their runtime for the Symbian S60 platform you can run the same app on both MS and Symbian based phones.