YouTube Time Machine helps you reminisce with YouTube videos from a certain year
YTTM apparently stands for "YouTube Time Machine," although that's not specifically mentioned on the site. What it does is very easy to understand, though. You move a slider to a specific year between 1860 and 2010, and you get a bunch of YouTube videos related to that year. Yes, I said 1860 (that's not a typo).
Not all hits are spot-on, though. When I chose 1972, I got a video from 1970. So, I guess you could say YMMV with YTTM (sorry, couldn't help myself there). But for the most part, the hits are relevant. I think it just takes the year from the video's name on YouTube.
You can narrow your search down by categories, such as Video Games, Television, Commercials, Current Events, Sports, Movies, and Music. I'm afraid there are not many video game related videos from the 19th century, though.
One detail which annoyed me was that toggling a filter reloads the entire page. It's as if AJAX was never invented – you click a button, and suddenly the whole page blinks out and reloads. I hope they get that fixed.
Notwithstanding this one quirk, YTTM is a nice way to travel through time. Just dial in a year, and watch the videos. When you've had enough of a certain clip, you can just click Watch next video and be transported to the next one – no searching involved.