YouTube playlists are great for watching a ton of episodes of an old show, music videos from a compilation, or a bunch of Let's Play videos in order, but if you close your tab or browser, you'll have to remember where left off. ResumePlaylist is a simple tool that does the remembering for you so you don't have to.
All you have to do is paste in the link to the YouTube playlist you want to watch over at ResumePlaylist. Watch like you would normally (of course, you have to watch the videos at ResumePlaylist, so if you were hoping to comment/like/subscribe on any of the videos you'll have to make do with the on-video controls and buttons), and the site will remember your place in a video, and in a playlist. That way if you have to reboot, close your browser, or come back to the playlist later, you can return to the site and immediately pick up where you left off without having to do anything.
The best part is that you don't even have to re-paste in the playlist link -- the site caches your place and picks up immediately. It even remembers the past 10 playlists you copied in, so if you want to watch something you've seen before, it's a click away. Hit the link below to try it out.