The Internet Archive discovers and captures web pages through many different web crawls.
At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
Multi Domain Search Engine Placement - check multiple website domains rankings for one specific keyword in Yahoo search engine results.
One of the best tools analyzing and comparing websites of competitors and looking in how well those websites are search engine optimized for one specific keyword and what is search engine placement for the keyword.