Picasa 3.5 just came out... Picasa being the fantastic photo management software from Google. 3.5 features, among other things, photo tagging. Which is all fine and dandy... except that once you've started tagging people, it figures out what their face looks like and tags the rest of your photos automatically. It's insane. I mean... I tagged 1 photo of a friend of mine, and within a couple of minutes (I have many thousands of photos) it pulled up another 15 photos of the same person... perfectly matched.It's not foolproof, and you've got to keep tagging and fixing incorrect tags, but it's flipping awesome. Download it today. Oh, and the tags can be integrated with your Google Contacts... so you've got lots of fun options for stuff.