SafeShare.TV - the safest way to share YouTube videos
This site allows you to get rid of the ads and other videos around your YouTube video. The other cool thing is in some cases it allows you to crop the video. This way if you find a good video that is too long and you just want to show part of it you can easily crop it.
Keep Vid - This is my favorite video downloader, very simple.
Just make sure to just paste the URL and click download next to the box. In seconds you will get a choice of download options. I always choose the MP4 option.
TubeChop - lets you chop out the part of a YouTube video you want and share it.
EmbedPlus - a YouTube companion that allows you to crop, annotate, and mark a "sweet spot" along with tons of other features.
Also has a chrome extension that you can add on.
Zamzar - download YouTube videosThis is an online site that allows you to download YouTube videos for free.