Hi
From reading on E-bay (better) breeders state that after going through the post, 50% hatch rate is what they would expect, as the postal system affects fertility. They also say to rest the eggs (pointy side down) for at least 12 hours, preferably 24hrs. I am not experienced, so not sure why, but it probably allows "everything to settle" down inside before starting incubation. I have only read about this, as I am considering at some point hatching some; so far I have only ever reared from day old purchases.
See if you can candle the eggs (hold them up to a strong light bulb if necessary) and see if the eggs have any "growth" in them. if they don't, then they were infertile (too old, postage, etc) if there was growth then they died in the shell for some reason during incubation.
You still got 41%, which after posting and no resting, may not be bad, tho disappointing. It will be interesting to see what the black one turns into! Please keep posting photos to your flickr site :)
This site
http://www.rivercottage.net/forum/ has a poultry sub forum, with some very friendly, helpful experienced chicken "breeders" who post; they may be able to help in the future if you wish to ask questions from people who may not come to this allotment forum.
mat