Train Station

Your daughter IS adorable! She as the cutest little smile, and sometimes a look that looks like she is trying to get out of trouble... "you know that you love me still, right mommy?" *angelic face*

And I don't consider you an amature either. I am in awe over the portraits you take!

Don't get me wrong, she is cute, I have to agree, ooops, never mind. hehehehe

he means a grey card.  There are fancy ones with white and black points as well as colors.  I carry a grey card with me, and I do use it.  You take a picture of the card first in the lighting you are using, and then balance the rest of your pictures to that neutral grey card.  I hope that makes sense.
Some may not agree with me, but it's not foolproof.  In this situation where the yellow cast wasn't even, it reflected off some surfaces and not others it may or may not have worked. 
You will know what I mean if you ever try to sample a white spot on your image with the levels tool and turn your whole picture garish blue.  You keep sampling until you get a spot right, but sometimes it's just not perfect.  BUT, like I said though, it would have been worth a shot, as it takes a second to grab the card and have your model hold it for one shot.  So that may have saved me a few minutes on that one picture.
Travis was joking about running away because he has told me I need to do this before, and he isn't wrong. 

White card   

Well . . . very cute kid!  Is she about 6?  I have one of those myself.

Don't let anyone fool you into thinking that RAW is the answer for every problem.  Color casts caused by reflecting walls are not the same as white balance problems.  First, they often affect different portions of an image differently.  Second, they are mixing with the direct light coming from over head and creating casts that you can't predict. 

I have found, over the last two years, that my D80 (sniff!) and my D200's do a great job with auto WB.  I was less happy with the Canon's that I shot with (someone elses).  I am trying to start anything there.  The Canons were older models than the Nikons that I am using now.

At this point, I still prefer shooting jpegs and keeping my workflow simple.  I am open to RAW at some point, but I am not there yet.

Ed