JavaTechniques is a nice site with, to quote it's author, "a small, but growing collection of Java howto's and examples". It's also a nice example of how to put together a collection of content over time with WordPress as the CMS.
I got the chance to use the Photo Shuffler I posted about a few weeks ago. It's even better than it appears. Very simple and straight forward. The instructions are commented into the code that you insert into your page. The only trouble I had was getting the existing CSS to quit interfering with the shuffling images. The site I used it on has a subtle border effect on all photos built into the CSS. When the photos shuffle, the photo with it's outline fades out revealing the next photo behind.