Poco

This plugin searches your blog posts for images that are hosted on Blogger (blogger.com or blogspot.com), 
downloads them to your server, and updates your posts to refer to the downloaded versions.

Blogger Image Import

A plugin that copies blogger hosted images to your local server and updates the links within the posts.

If you just migrated from the Blogger’s Blogspot service to a self-hosted WordPress, and would like to keep the traffic and old visitors as well as the permalinks valid, this plugin is for you!
This plugin is just part of the tool needed for migration. For a complete guide, please refer to the my <a href="http://hellosam.net/post/397" rel="nofollow ugc">blog post</a>.

Blogger Redirector

Redirect or accept the permalinks, post, feeds requests forwarded from Blogger to apporiate page on WordPress.  Useful for migrating the traffic from  …

Blogger Image Import vs Blogger Redirector