Rules to Ultimate Frisbee are available in three forms:

ftp://hyper.stanford.edu/pub/mbg/UltimateRules/UltimateRules.ps  
                                                         -- postscript
ftp://hyper.stanford.edu/pub/mbg/UltimateRules/UltimateRules.txt 
                                                         -- formatted text
http://hyper.stanford.edu/~dhinds/frisbee/rules.html  
                                                         -- hypertext (HTML)