Sorry I haven't replied sooner, I was having computer problems. I found out about the wing sexing on BYC, but this is the first time I have used it, so I don't know a whole lot about it. But it seemed to be consistent with the sexed ones at
TSC. When they are a few days old, the easiest for me is 3-5 days, but I could still tell a difference at 1- 1 1/2 weeks, it just wasnt as noticable.
The pullets grow their wing feathers in faster, so their feathers are longer and a little uneven, there are usually two rows of feathers growing. The cockerels don't grow their feathers in as fast, their wings are shorter and the feathers are all even along the edge. I picked up the roo and a couple pullets when they were about 1 1/2 weeks old, and his were still shorter than the pullets.
I have someone that wants all pullets, but they do not have their coop ready for them yet, so I will be keeping them probly another 2 weeks or so, so I will hopefully see other signs by then (larger, redder comb, etc) and see if there really is only 1 roo.
Oh yeah, there is also a video on You-Tube, that is what I watched, it makes more sense if you can see what I am talking about. Just do a search for sexing chicks, I don't remember for sure what her user name was though.