A NextGENeration Photo gallery for the Web 2.0.
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This plugin will generate a sitemaps.org compatible sitemap of your WordPress blog which is supported by Ask.com, Google, MSN Search and YAHOO.
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A highly configurable WordPress sidebar widget to list pages and sub-pages. User friendly widget control comes with various options.
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cformsII offers unparalleled flexibility in deploying contact forms across your blog. Features include: comprehensive SPAM protection, Ajax support, Backup & Restore, Multi-Recipients, Role Manager support, Database tracking and many more.
http://www.deliciousdays.com/cforms-plugin

Customise the order your pages are listed in and manage the parent structure with this simple ajax drag-and-drop administrative interface with an option to toggle the page to be hidden from output. Great tool to quickly re-arrange your page menus.
http://wordpress.org/extend/plugins/pagemash/