A part of the tools suite, grab download links for YouTube videos without any extensions or java/flash plugins!
If things goes wrong here, try this tool instead! (Also works with Vimeo, DailyMotion, e.t.c.)
With this tool, you can quickly and easily grab youtube stream links, which would allow you to download youtube videos.
Drag the link above into your bookmarks bar and click on it when you're at a YouTube video page, this will launch the server script from that page. Or simply input a YouTube link in the box above.
The site currently has no ads, which differs it from most other services already avaliable, and has a easy to use service that has a bookmarklet that works even when YouTube is in https mode.
As of January 2014, YouTube has not throttled this method, but has blocked 1080p video. 1080p and above uses a different method of streaming, where your viewing time is tracked and a small portion of the video is downloaded "as needed", which makes the intended use of YouTube (for video being shared) more true, however prevents a full 1080p video to be quickly downloaded/streamed on fast bandwidth (though it saves bandwidth).
Code from this service serves as the basis of a YouTube age bypass extension. As the data is now shared across services, expect the server to take a little bit more to deliever the service.
This service is offered as an alternative to KeepVid.com
Disclaimer: Use this services on videos you have the right or permission to download!