So a new proof of concept was born. I wanted to achieve a few things:
1. Easily see the actual power consumption
2. Switch light(groups) from the touchscreen
3. Implement a present/away/sleep state
I used the built in Plugwise template engine to build an interface which is running fine now for a couple of days. The code is not the most beautiful program, but it still is a proof of concept

I've "designed" it to use on a 320x240 screen (so on my Windows mobile phone it is now shown in internet explorer in full screen mode in landscape orientation).
Some screenshots:
For those interested to play with this this as well I've attached the files to this posting. Just unpack them to the folder c:\Program Files\Plugwise\Plugwise Source\www\mobile and access it via http://<your server>/mobile/index.html
I am using some naming conventions for group names:
The Aanwezig/Afwezig/Slapen buttons use the groups _Status_<Aanwezig/Afwezig/Slapen>_<Aan/Uit to turn on/off devices when pressing the button. So for example when pressing the Afwezig button, all devices in group _Status_Afwezig_Aan will be turned on and all devices in group _Status_Afwezig_Uit will be turned off.
For the room menus I use the namingconvention _<Room>_<Buttonname>. So for the lights in my livingroom I have _Woonkamer_Verlichting which results in the Verlichting item with an AAN/UIT button to turn on/off the devices.
<b>Download Attachment:</b>

Have fun!