I've long been a fan of the SimilarPages browser addon, which allows me to right click on any site and the resource will give me a list of similar sites. It's great when I need alternatives or I get stuck, or just for when I want a bit of variety. I got an email from Pietro Borradori, the CEO who told me that they've now produced their own SimilarPages search engine. I've played around with it, and it's fun. Simply type in a URL of a site that you know, and the engine will find other related sites for you to look at. I tried my own site (obviously!) and I recognised a good 70% of the results that were returned to me, and most of the others look worth exploring. It's not 100% accurate, but nothing ever is. You can also word search and see some results, click on a link and see a second column of results, as well as a preview of the site you were interested in.