Thanks, everyone, for your replies!!
I took some more pics this evening, tried to get a little better.
1. Could this be a dominique? It (she??) is marked like the pics of 3 wk old dominiques I found on the 'net. She has (I think) a rose comb, which I think Australorps are supposed to have single combs. Or could it be a barred rock? she has a dark wash on the front of her legs but the rest of the legs are yellowish/orange.
2. Any thoughts on this cutie? He/she has some feathering on the legs.
3. This is the suspected silkie mix. Could it be a sultan? I saw a pic of one last night. S/he has black skin, black legs and I think a walnut comb. S/he (named Zsa Zsa) is obviously the oldest, as its all feathered out. Also the top of the pecking order, but rather nice to the little ones.
4. The other bird in with the white bird - I suspect this is a roo. The legs seem thicker than the others of the same age, and the comb seems bigger. Here's another pic:
Thanks for all your help! Now I just need to figure out the smilies.

)
Melissa