Polaroid Puritans will probably shake their developing Polaroids in disgust at Poladroid, but as an amateur digital photographer, I think it's pretty cool. After a quick download and install, drag and drop your photos onto the application's camera icon, which will then spit out a "Poladroid." It sits on your desktop "developing" (virtual shaking optional, but not required) until a bell sounds indicating your pic is ready. The result has nice Polaroid-like details and coloring which provide more nuance than you'd get from just dropping a digital pic into a Polaroid frame in Photoshop. One of my drop-down menus is in French, which is odd, but otherwise, an exciting find!
Download for yourself here: http://www.poladroid.net