I'm surprised I haven't written about this web 2.0 application yet. It's been pretty well known, and in the news for quite a while. I started a profile on there several months ago, but really haven't taken the time until recently to start uploading some of my collections of photos.
Flickr makes it easy to upload, tag, and most importantly SHARE your photo's with other. Through the use of third party applications you can do a ton with your photo's once they're up. Anything from order prints, to make DVD's, to using your photo as stamp. Now how cool is that!
Check out the photo below. Clicking on it will take you to that "set's" slide show.