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Dan Cameron
From the author, “Using this Wordpress plugin you can add Google AJAX Search to your site. Included by default is a Blog Search, Web Search and a secondary site search ideally for your flickr or other photostream. Support the plugin by testing it out and giving feedback to make it better. Widgetized and ready to drop in.”.
From the author of the brilliant plugin tying your feedburner into WP, comes this informative tutorial on adding an animated live search to your blog.
bsuite MaisonBisson.com
A pretty comprehensive plugin (not yet tested, but inted to) that also includes some handy search features as well as incorporations of tags with searches. Could be a handy tool to help your readers find more of your content.