Clone2go YouTube Downloader is a very nice free video downloader. You can use it to download videos from YouTube and save them in three different formats: MP4, FLV and 3GP. The app has a very simple user interface that allows you to download 1 or several videos very easily. All you have to do is add a video URL, select the format and click on "Download".
There aren't many settings you can play with. However, there is a checkbox that reads "HD MP4 if its available". This is one feature that I must absolutely have in a YouTube video downloader. I just love HD content. If you check this option, whenever there is a high definition version of your video available, it will be downloaded. This is absolutely automatic; you don't have to select the version on your browser or anything like that.
In my testing, I downloaded a few HD videos just to see if the HD capabilities worked. And they did. My 30-megabyte video was downloaded very fast, and it looks every bit as good as it did on my web browser.
In short, this is such a great free tool. Many commercial downloaders don't work as well as this one.
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