My favorite jQuery plugin by far has to be the jQuery Cycle Plugin. It’s a generic slideshow plugin, but it’s versatile enough that I’ve used it to build a slider, a portfolio, and just recently, an iPhoto-like image flipper. This was inspired from the CJ Image FlipBox. Unfortunately, the way the plugin is designed, you can’t mesh it with Fancybox because the plugin creates an anchor and an image which intercept the mouseclicks preventing the Fancybox from activating. So to get around the problem, I used the Cycle plugin to create my own.