J.S.
I don't have multiples but a very close friend of mine does and here are some websites I found for her that are very informative. Also, she and I both had boys before the birth of her twins and our boys tend to act out more than the girls, and develope a little slower in speech and such, in physical skills (walking, motor skills) the boys were faster to develop. That has been our experience at least.
I hope these websites help. Some are for twins but scan through the links because there are also triplet web site links mixed in there.
www.tisfortwins.com/directory.html
http://www.tripletsandus.com/triplets/links.htm
Good Luck.