If you wish that there were an easy way to find sites that you like, then SimilarSiteSearch might just be what you’re looking for. SimilarSiteSearch allows you to input the URL of a site, and then view a list of sites similar to that site. Think of it as AlternativeTo, but for web sites.
You won’t get results right away for every site you enter. For lesser known sites, SimilarSiteSearch will queue the query, perform its magic, and then add the site to its database. If you return a few minutes later, you should then be able to run the search again and see the results.
When reviewing search results, you can give a site a thumbs up or thumbs down to indicate whether it is in fact similar to the site that you input. Future searches for that site will then take the rating into account.
After getting results, you can fine tune your search by specifying tags that you want the search to include or omit. You can also rate sites, and see a list of similar sites recommended by other users.
For another search engine that does much the same thing, also check out SimilarSites. Do you know of any others?