SiteRapture has just added a new service / website today called Dataopedia (added to our Directories Category in the Website Directories Sub-category). Dataopedia just announced it's launch (TechCrunch article) and is a directory that helps users find information on websites including traffic data, domain whois information, contact information, etc. It's definitely worth checking out if you are a professional and need very technical, specific info about a website / online service. The data is very useful for technofiles and Internet professionals but not as useful for general consumers as you need to not only know what you are looking for, but have an appreciation for data that most consumers don't really care about like Whois info, Traffic Reach or PageRank.
That said, the service is new and I am sure they will be launching a lot more in terms of features and content.
Stay tuned for our official review after we have spent a little more time using the service.