Lars,
Awesome work on the front end, it's shaping up very nicely! I've attached some screenshots below of the skin I'm working up for mine (if anyone wants the images and PSDs, just PM me).
A few questions:
1) Can you add a feature allowing the user to associate a program with the poweroff image? When the poweroff image is pressed, this would shutdown the application as normal, but also launch a program. The user could launch a program for instance that would shutdown Windows or put the computer to sleep.
2) The sounds you've added are great. Can you also add the ability to associate a sound with changing configs?
3) There is some image flicker when changing configs. The background image briefly becomes visible where the config image would normally be. This is pretty minor, but would be nice if there wasn't any flicker.
I haven't put together pagenumber images for the separate configs yet, but it looks like you set it up perfectly. I'll post some images when I get this done.
Again, thanks for all your work!