"Alexa Internet was founded in 1996 by Brewster Kahle and
Bruce Gilliat. The company offered a toolbar that gave
Internet users guidance on where to go next, based on the
traffic patterns of its user community. Alexa also offered
context for each site visited: to whom it was registered,
how many pages it had, how many other sites pointed to it,
and how frequently it was updated. Engineers at Alexa, in
cooperation with the Internet Archive, created the Internet
Archive's Wayback Machine. Alexa also supplies the Internet
Archive with web crawls." -- wikipedia.com
Here's
a list with more information about Alexa. Check it out.
