The Pinball Archive is the longest-running pinball site on the Internet, having originated as an FTP site in January 1993. Now maintained by the Professional & Amateur Pinball Association, the Pinball Archive provides rule sheets, gameplay videos and tutorials, and a tournament calendar.
For more pinball fun, we recommend the PAPA site, Replay Foundation, the PAPA blog "Shoot Here and Here", and the Internet Pinball Database.
We'll see you at the arcade!