AceTube - Free YouTube Downloader

AceTube allows you to download YouTube videos so you can watch them offline!
* Fast download mode(with multiple connections for a download)
* Multiple download resolution options
* Background, multi-download
* Resume downloading
* Downolad as MP3/M4A
* YouTube search and related videos suggestions
AceTube YouTube Downloader enables you to quickly access, search, share, and download YouTube videos.
Because downloading always happens in the background, you can go on watching YouTube, surfing the Internet, tweeting, and listening to your music as you download.
Fast downloads: We used AceTube to grab an array of videos and never once experienced any delays. All downloads, regardless of output format, preserved the quality of the original video.
Easy to use: This application is very straightforward, especially with its uncomplicated design. The large URL window and limited amount of buttons make downloading videos an easy task. It is all contained within one window, reducing confusion tremendously.
BOTTOM LINE
AceTube does exactly what it promises, offering an easy way to download videos. If you use YouTube for all your video needs, this is the perfect download. If you want a tool that will download videos from other sites, you may want to try out other options.