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AjaxRain is a resourceful site that provides you with a catalog of sorts, full of Ajax, javascript and Dhtml examples.
These examples and demos can be downloaded for your own personal use. You can submit items to be included in the AjaxRain directory as well. Provide a title, description and the script, and it will be sent along to be added into the site. There's really only two ways to search AjaxRain--peruse through the pages of resources, or check out the tag cloud, which indicates the number of resources for each term.
Adding a search bar would probably make browsing easier on the site. Each resource will take you to the original source page for the particular example or demo; there's no "profile" or informational page for a particular resource. Having the ability to comment or rate resources could be helpful as well.
In other Ajax news, Tibco is holding a World's biggest mashup contest.