Source: http://lifehacker.com/5558385/waachen-saves-online-videos-to-watch-later-is-like-instapaper-for-video
Wacchen is an online bookmarking service that saves and stores all the online videos you run across in one place via a simple browser bookmarklet. It works very similarly to bookmarking, article-saving service Instapaper, but for video.
Wacchen saves videos from over 70 web sites with the click of a bookmarklet, including video sites like YouTube, Vimeo, TED, and tons more.
Once you have an account, grab the bookmarklet and place it on your browser for easy access. When you surf the web and stumble across an interesting video, click the "Watch It Later" bookmarklet. Wacchen will save the video on its website, where you can later access all videos for future viewing.
It's a great way to keep track of videos, when you don't have time to watch them right away or in the middle of something. Wacchen requires an account to work.