Sneaking in a clip or two on YouTube in the middle of the day at work is great, but when your boss walks in and you have to quickly close the browser window you end up losing your place. Pause for Later is a webapp that stores the exact location of the video so you can resume watching it later.
Pause for Later supports video on YouTube and Vimeo (and Hulu, though that's less relevant for us). Once you download the Chrome extension you can click the pause button in the toolbar and the video's location is stored on the webapp. When you want to watch the video, head over to Pause for Later and you can resume playing the video right where you left off.