Proggybar is an easy-to-use and completely customizable progress bar solution that provides an attractive, timed visual display for your visitors while they wait to be transferred to a another page. The progress bar color, opacity, background, border, space between individual units, and length of time before transfer are all customizable.
On Flickr, you never know where people that visit your photo have found it. Flickr: Add referrer into comments is a greasemonkey script that will add a small amount of text at the end of your comments saying where you come from. If everyone starts using this script, then it will be easy to see where the people have found your photos and how they got to comment on them.
ajax-cross-browser-using-iframes uses Iframes, an empty div, and innerHTML, allowing you to create AJAX calls. It is a little bit confusing at first, but once you understand it and place the necessary nested PHP files, it will allow you to create unimaginable things. It is cross-browser.
SD-Scroll is an easy-to-use and completely customizable vertical news scroller with support for images, custom backgrounds, links, adjustable scroll speed/direction, and 9 different frame styles. SD-Scroll comes with 21 background images and over 70 different mini-images. It is easy to configure and use and provides a convenient way to provide news and other information on your Web site.
Link Show is an easy-to-use and completely customizable preview-type menu system. The Images version supports image previews, and the vertical/horizontal text versions support text previews and have a collection of four colored bullets. All versions include custom cursor support and a variety of border styles, and provide a unique way for visitors to navigate your site.