I really like the idea of a site that focuses specifically on estate sales because they really are a different type of sale, and to find them on more generalized sites like craigslist, you've got to scroll through a lot of listings. The site has a featured sale page, which contains sales from established estate sale companies known to the admin of the website.
The other cool thing about this site is that it has other content as well, such as the Collectors Corner page which offers tips on finding and identifying valuable items. Recent posts in the Collectors Corner include advice on collecting antique maps and suggestions for identifying genuine Roseville pottery.
I have to admit that I've been slow about visiting estate sales lately, and this site is inspiring me to get back to it. In addition to vintage and collectible items, you really can find anything and everything at an estate sale. I found a Dole pineapple recipe card once for under a dollar that ended up selling for $15, so you just never know!