The WP-Tube for YouTube plugin can automaticaly import your Youtube videos including their description, keywords and attributes right into your blog stream. It uses the Youtube, GData API to get the videos and you can customize it specifying which Youtube username to use and how often to ‘ping’ the Youtube API to check for new videos as well as setting the size and color of the Youtube player.
Comming soon… 
Custom template for layout as well as support for custom YouTube players such as ‘Youtube with style’

WP-Tube

Automaticaly import your YouTube videos into your Wordpress blog as posts

imanabuhaydari

Iman Heydari

This plugin functionality happens when you want to save a new post, it searches for external image links, and uploads them into your site, then attaches the images to the post. 
This plugin is so light and has been written with the least codes, So it does not decline your site speed.
You can set the first image as a thumbnail, while uploading.( Please turn on the related switch in settings page )

Automatic Image Uploader

A useful and simple plugin

The plugin works, but version 1.3.1 has drawbacks: 
1) The unloading process breaks down when phrases like "$70/month" are found in the post text (wp_extract_urls sees this as a url, processing $urls causes an exception). 
2) Does not work correctly with urls having parameters.

The plugin is wonderful, but needs to be improved

This plugin search for images in the content of posts and upload it automatically.

WP-Tube vs Automatic Image Uploader