iDew is up for sale at the App Store! You can check it out by searching for iDew inside the iTunes Store or by clicking this link (the browser should open this link in iTunes).
Basic usage of the app is this -
- Take a photo using the camera
- Launch iDew
- Load the photo
- Watch how the photo mists up!
- Change/wipe the mist using your finger
- Save
- Email your "mistified" photo from the Photos app or download it to your computer
Here's a few more examples of photos saved by iDew.