Every now and then you come across a type of website that has excellent content but not that specific item you were looking for. You are pretty sure that a similar website might have that, but you have no way to see what are some of the similar websites. Gladly, there are ways to do so. This type of browsing is often referred to as “associative browsing” and one of the best tools for this is SimilarSites.com
SimilarSites is a neat web application that allows you to find sites with similar type of content. All you need to do is enter the URL of the website and click submit. The application will then display websites that have similar content. You can also use it through a Firefox-addon or install a SimilarSites tool bar that would help you discover content similar to what you are currently browsing. Once the results are displayed, you can vote each of the resulting website up or down based on what you think the similarity level is.
My search for websites similar to YouTube came up with results like Vimeo, DailyMotion e.t.c.
You can also use SimilarSites through Twitter by just sending a tweet with the site name and include the hastag #similarsites. You will receive a reply with direct link to similar websites.