Pre-orders are being taken by a company called FlexiSpy that promises the ability to spy on Symbian, Pocket PC, and Blackberry devices. It apparently gives you the ability to remotely monitor a phone’s log/history as well as tap into real-time data:

FlexiSpy Pro allows you to specify a phone number from which you can call their mobile phone, and rather than the phone ringing, FlexiSPY PRO activates the microphone on the phone, so you can listen in to what is happening where ever the phone may be or whatever they may be doing. Call their phone, and you now are the ‘fly on the wall’ that we’ve always wanted to be sometimes listening in on their conversations, actions, etc.

Might be handy to spy on yourself to keep a log of all activity…