Pinbrawl, a pinball tournament that takes place yearly, has amassed a small but devoted cult following, bringing in serious pinball competitors from around the world. A very professional and standings-oriented environment for pinball play, Pinbrawl is taken very seriously by those involved.
Complete rules can be found here: http://www.ournet.md/~pinbrawl/rules.html
Also, http://www.pinbrawl.com, a recently created website devoted to online pinball gaming, has absolutely nothing to do with the Pinbrawl tournament, but is lots of fun in its own right.