These wordpress plugins have been tested on wordpress 2.9.1.
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Category Order – allows you to order categories – http://wpguy.com/plugins/category-order/
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postMash – order posts on the fly – http://joelstarnes.co.uk/blog/postmash/
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WP Post Sorting – sort posts differently by category – http://www.reflectionmedia.ro/2008/12/wp-post-sorting-plugin/