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Does anyone here know the basic standards for guppies? I'm mostly interested in dorsal length and tail rays, but I can't find much online.
If anyone can help out or knows a good site, I'd appreciate it

For animals, the entire universe has been neatly divided into things to (a) mate with, (b) eat, (c) run away from, and (d) rocks. - Terry Pratchett

I don't know ANYTHING about the IFGA or their standards, but I do have good googling skills! You might have already found these sites, but some help is better than no help I always say!

http://guppyinfo.com/index.php?option=com_frontpage&Itemid=1
They seem to have some articles on specific strains with very detailed diagrams for fin length. Couldn't find anything general or basic (most of the stuff flew right over my head to be honest) but I'm sure you may find something if you poke around or email some of the breeders.

http://guppywiki.org/index.php/Main_Page
There's the guppy wiki, though informative, seems to be a bit too general.

http://www.ifga.org/publications/publications.htm
And, if all else fails... you can always buy the IFGA judging book, which "contains all the information you will need as to what are the IFGA standards for a male and female guppy." $13 bucks ain't too bad if you are serious about breeding show guppies.

Good luck