ClipGrab

ClipGrab is a very easy to use application that can download YouTube videos and convert them to various formats.
A clean and well organized interface is being used to display some random YouTube videos, while a search box lets you look for a specific clip just as easy as you normally do when you use the browser.
Features are nicely organized in tabs, so go over to “Download” to start a new download and configure the output file settings.
You can choose between multiple formats, including the original one, MPEG4, OGG, WMV and MP3. Depending on the video quality, you can choose a different quality for the downloaded file too, so HD videos can be retrieved with the best possible resolution.
The settings screen allows you to configure a default destination folder, but also configure clipboard monitoring to automatically start a new download whenever you copy a video URL to your clipboard.
Proxy servers are also supported, and so is a notification system to let you know whenever a new download comes to an end.
ClipGrab offers a pretty good download speed and the machine isn't slowed down at all during the process. The application runs smoothly on all Windows versions and it doesn't require special user privileges on Windows 7 workstations.
Overall, ClipGrab is quite a helpful tool to download YouTube clips. It doesn't require more than average computer experience and it performs the conversion task in a matter of seconds.