sagie

WordPress Tumblr AJAX Widget creates a widget you can use in your blog that would draw posts from a Tumblr blog feed and
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WordPress Tumblr AJAX Widget

Simple plugin that launches an AJAX call to a selected Tumblr blog and displays the last couple of posts.

fsquared

The F2 Tumblr Widget displays recent posts from the provided tumblr blog.
It allows the user to select how many posts to display, to restrict which 
posts are shown by type and tag, and to render the posts as either a list 
or a slideshow.
Posts can be displayed in full, as title only, or with an excerpt. Photo, 
video and audio posts will have the media displayed when the display type 
is not ‘title only’.
The audio player in posts can now be automatically resized to match the 
selected media width – this is enabled by default, but can be deselected 
in the widget setup.

F2 Tumblr Widget

This widget displays recent posts from a tumblr blog.

WordPress Tumblr AJAX Widget vs F2 Tumblr Widget