White balance weirdness with Lightroom 2?

I'm using a Nikon D700, so I can't go back to Lightroom 1.4.1, which doesn't include support for the D700 (or does it?). I also can't do a side-by-side comparison of 1.4.1 and 2, but I do get the impression that 2 produces some rather crazy results when I use the eye dropper tool to do a white balance.
For example, I've got a shot of my brother, his wife, their son, and my son walking hand-in-hand through a parking lot. It's a lousy photo, so be thankful that I can't post it here. I try to do a white balance on my sister-in-law's shirt, which should be close to white, and I get a color temperature of 18,000 (and a tint of -5). If I do it on my brother's roughly white socks, I get a color temperature of 25,000! I can't remember ever having seen numbers that high with earlier versions of Lightroom. Other places in the photo (my brother's blackish backpack, my son's reasonably white shoes, etc.) get me color temperature values between 8000 and 13,000. In all cases, the adjusted photo looks way too yellow to me.
I realize that it's hard to diagnose my problem just from reading a description of it, but does anybody have any advice for me? I can't turn back the hands of time and do gray card reference shots, but I feel like I'm spending much more time trying to find a decent white balance than I ever did with 1.x, and with some photos I end up just throwing in the towel.
Technical details:
Lightroom 2 (Camera Raw 4.5) on a 20-inch PowerPC iMac, running OS 10.4

Thanks to all three of you for your helpful, speedy replies.
Eric, I used yousendit to send you a NEF file that's giving me trouble. I had the camera's white balance set to daylight when I took it, and they were walking through a mixture of sunlight and shade late in the afternoon, so obviously the white balance is not consistent throughout the photo, but as I noted in my original post, I can't understand why using the eye dropper tool in Lightroom 2 gives me such enormous numbers and such a yellow cast.
John, with that same shot I tried hitting "WB: Auto" in the Develop module, and the result was much more natural-looking than anything I could come up with on my own using the eye dropper. I then went back to other shots that had been problematic and found the same thing: "Auto" did a better job than I could. On the one hand, it's nice to know that such a powerful tool is available; on the other hand, it's a bit depressing to think that my best efforts at white balancing are still incompetent.
What's more, I still think that white balance in Lightroom 2 is behaving quite differently from what I was used to in Lightroom 1.x. Do I just have to try to become comfortable with the idea of ceding control of white balance to "WB: Auto"?

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