ClipGrab screenshots

This app helps you download clips from various video sharing websites.
Program Preferences
ClipGrab 3.4 : Program Preferences

Alternative downloads

MediaHuman YouTube Downloader
This app lets you download YouTube clips with just a few clicks.
4Media Online Video Downloader
Online & YouTube video downloader to download HD video from Metacafe, Vimeo, Break.
Aimersoft YouTube Downloader for Mac
This app lets you download and convert YouTube clips on your Mac.