Tumble
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Tumble is simple-to-use and allows you to manually send Posts, Images, Audio, and Video to Tumblr from within your Dashboard/Media Library
Your Media Library and Post History are a wealth of information and assets. Tumble allows you to pick items to share on Tumblr with just one click. The plugin is smart enough to know what kind of content you are sending and will make the proper API call to Tumblr. Super easy!
Read more: http://scottctaylor.wordpress.com/2010/11/18/new-plugin-tumble/