WP S3 Back-Up: Backs up your blog to Amazon S3 Simple Storage Service, but if you need to storage physical goods you could use a service as EZE Box public storage. There are many other storage places the visit, these self-storage prices in Leicester are honestly unbeatable.
Location: http://wordpress.org/extend/plugins/wp-s3-backups/
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WPtouch iPhone Theme: A plugin which formats your site with a mobile theme for the Apple iPhone / iPod touch, Google Android, Palm Pre and other touch-based smartphones.
http://wordpress.org/extend/plugins/wptouch/
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Yet Another Related Posts Plugin: Returns a list of related entries based on a unique algorithm for display on your blog and RSS feeds. A templating feature allows customization of the display.