Scott Taylor

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/

Tumble

Tumble is simple-to-use and allows you to manually send Posts, Images, Audio, and Video to Tumblr from within your Dashboard/Media Library

dechadou

This plugin will allow to import images from any Tumblr blog into wordpress. 
It will automatically create the posts with the image set as Featured Image.
You can also set the post format (Standard, gallery, etc), the ammount of images to be inserted and the status of the post (Published, Draft).

Tumblr Image Importer

This plugin will allow to import images from any Tumblr blog into wordpress.

Tumble vs Tumblr Image Importer