Mirror, mirror on the wall.

If I've got an important dinner or party or business meeting, I can literally spend an hour in front of the mirror, trying on different outfits, trying to decide which is best. Half my problem is that once I've taken off outfit one and put on outfit two and three, I can't remember if outfit one looked better. (Guys - don't ask: it's a girl thing.)

So my idea is to create a mirror with a small digital camera built into it.

You put on outfit one, and set the camera to take a pic - there's a 5 second delay so you can strike a pose. Then, you try on the next outfit, and take another picture.

Using a magnifying mirror, the image on the camera's small plasma display can be reflected onto the mirror's surface (this way, you don't need to make your whole mirror into a plasma screen, which would be too expensive.)

You can run a slide show once you've finished storing pics, and just pick the best one. You can take pictures of your back, so that you can determine for yourself whether your bum looks big in this outfit.

You can store the pictures, so next time you have a wardrobe crisis, you don't have to try everything on again.

Edit: This idea is similar to an idea posted previously (see link) - but I think this is sufficiently different? Mine is a tool for solving wardrobe crises. I don't see this ever being used for surveillance or using video - it's just a little digital camera, built into a normal mirror.